Sen. Cory Booker kneels alongside an attendee sitting in the back row just before he's introduced during a campaign event at the RiverCenter in Davenport, Sunday, March 17, 2019.

Sen. Cory Booker kneels alongside an attendee sitting in the back row just before he's introduced during a campaign event at the RiverCenter in Davenport, Sunday, March 17, 2019.

 Marc Kover of Washington, Iowa, stands outside of the RED Berry Café in Muscatine with a sign in support of Sen. Kirsten Gillibrand after seeing her speak, Wednesday, March 20, 2019. Kover is a registered republican who is says he'll consider supporting a Democratic candidate.

Marc Kover of Washington, Iowa, stands outside of the RED Berry Café in Muscatine with a sign in support of Sen. Kirsten Gillibrand after seeing her speak, Wednesday, March 20, 2019. Kover is a registered republican who is says he'll consider supporting a Democratic candidate.

 Potential voters watch out a window from the living room as former Texas congressman Beto O'Rourke shakes hands with guests in the front lawn before a meet and greet in Muscatine, Thursday, March 14, 2019.

Potential voters watch out a window from the living room as former Texas congressman Beto O'Rourke shakes hands with guests in the front lawn before a meet and greet in Muscatine, Thursday, March 14, 2019.

 California Sen. Kamala Harris, a Democratic presidential hopeful, is introduced by Iowa State Rep. Phyllis Thede during a town hall at the Waterfront Convention Center in Bettendorf, Sunday, Feb. 24, 2019.

California Sen. Kamala Harris, a Democratic presidential hopeful, is introduced by Iowa State Rep. Phyllis Thede during a town hall at the Waterfront Convention Center in Bettendorf, Sunday, Feb. 24, 2019.

 Vietnam veteran Mike Martin of Davenport wipes a tear from his eye as Sen. Amy Klobuchar speaks about her experiences working with the late Sen. John McCain during a meet and greet at Hickory Garden Family Restaurant in Davenport, Sunday, March 17, 2019.

Vietnam veteran Mike Martin of Davenport wipes a tear from his eye as Sen. Amy Klobuchar speaks about her experiences working with the late Sen. John McCain during a meet and greet at Hickory Garden Family Restaurant in Davenport, Sunday, March 17, 2019.

 Rock Island alderman Virgil Mayberry, 2nd ward, holds sign in support of California Sen. Kamala Harris, a Democratic presidential hopeful, during a town hall at the Waterfront Convention Center in Bettendorf, Sunday, Feb. 24, 2019.

Rock Island alderman Virgil Mayberry, 2nd ward, holds sign in support of California Sen. Kamala Harris, a Democratic presidential hopeful, during a town hall at the Waterfront Convention Center in Bettendorf, Sunday, Feb. 24, 2019.

 Mayor Pete Buttigeig reaches to turn off a fan after almost hitting his head while speaking during a meet and greet at Brew in the Village in Davenport, Monday, March 4, 2019.

Mayor Pete Buttigeig reaches to turn off a fan after almost hitting his head while speaking during a meet and greet at Brew in the Village in Davenport, Monday, March 4, 2019.

 Seen from a detached garage, presidential hopeful Cory Booker speaks to gathered democrats at a backyard party in Muscatine, Saturday, May 25, 2019.

Seen from a detached garage, presidential hopeful Cory Booker speaks to gathered democrats at a backyard party in Muscatine, Saturday, May 25, 2019.

 Presidential hopeful John Hickenlooper, the former governor of Colorado, talks with reporters in front of Mary’s on 2nd in Davenport, Saturday, May 11, 2019.

Presidential hopeful John Hickenlooper, the former governor of Colorado, talks with reporters in front of Mary’s on 2nd in Davenport, Saturday, May 11, 2019.

 Sen. Kirsten Gillibrand speaks at the RED Berry Café in Muscatine, Wednesday, March 20, 2019.

Sen. Kirsten Gillibrand speaks at the RED Berry Café in Muscatine, Wednesday, March 20, 2019.

 Sen. Amy Klobuchar shakes hands with attendees as she arrives at a meet and greet at Hickory Garden Family Restaurant in Davenport, Sunday, March 17, 2019.

Sen. Amy Klobuchar shakes hands with attendees as she arrives at a meet and greet at Hickory Garden Family Restaurant in Davenport, Sunday, March 17, 2019.

 Former Vice President and Democratic presidential hopeful Joe Biden speaks during a campaign event at Clinton Community College in Clinton, Wednesday, June 12, 2019.

Former Vice President and Democratic presidential hopeful Joe Biden speaks during a campaign event at Clinton Community College in Clinton, Wednesday, June 12, 2019.

 Former Texas congressman Beto O'Rourke speaks to a packed crowd during a meet and greet in Muscatine, Thursday, March 14, 2019. Beto announced Thursday that he will run for the 2020 Democratic presidential nomination.

Former Texas congressman Beto O'Rourke speaks to a packed crowd during a meet and greet in Muscatine, Thursday, March 14, 2019. Beto announced Thursday that he will run for the 2020 Democratic presidential nomination.

 Sen. Cory Booker kneels alongside an attendee sitting in the back row just before he's introduced during a campaign event at the RiverCenter in Davenport, Sunday, March 17, 2019.
 Marc Kover of Washington, Iowa, stands outside of the RED Berry Café in Muscatine with a sign in support of Sen. Kirsten Gillibrand after seeing her speak, Wednesday, March 20, 2019. Kover is a registered republican who is says he'll consider supporting a Democratic candidate.
 Potential voters watch out a window from the living room as former Texas congressman Beto O'Rourke shakes hands with guests in the front lawn before a meet and greet in Muscatine, Thursday, March 14, 2019.
 California Sen. Kamala Harris, a Democratic presidential hopeful, is introduced by Iowa State Rep. Phyllis Thede during a town hall at the Waterfront Convention Center in Bettendorf, Sunday, Feb. 24, 2019.
 Vietnam veteran Mike Martin of Davenport wipes a tear from his eye as Sen. Amy Klobuchar speaks about her experiences working with the late Sen. John McCain during a meet and greet at Hickory Garden Family Restaurant in Davenport, Sunday, March 17, 2019.
 Rock Island alderman Virgil Mayberry, 2nd ward, holds sign in support of California Sen. Kamala Harris, a Democratic presidential hopeful, during a town hall at the Waterfront Convention Center in Bettendorf, Sunday, Feb. 24, 2019.
 Mayor Pete Buttigeig reaches to turn off a fan after almost hitting his head while speaking during a meet and greet at Brew in the Village in Davenport, Monday, March 4, 2019.
 Seen from a detached garage, presidential hopeful Cory Booker speaks to gathered democrats at a backyard party in Muscatine, Saturday, May 25, 2019.
 Presidential hopeful John Hickenlooper, the former governor of Colorado, talks with reporters in front of Mary’s on 2nd in Davenport, Saturday, May 11, 2019.
 Sen. Kirsten Gillibrand speaks at the RED Berry Café in Muscatine, Wednesday, March 20, 2019.
 Sen. Amy Klobuchar shakes hands with attendees as she arrives at a meet and greet at Hickory Garden Family Restaurant in Davenport, Sunday, March 17, 2019.
 Former Vice President and Democratic presidential hopeful Joe Biden speaks during a campaign event at Clinton Community College in Clinton, Wednesday, June 12, 2019.
 Former Texas congressman Beto O'Rourke speaks to a packed crowd during a meet and greet in Muscatine, Thursday, March 14, 2019. Beto announced Thursday that he will run for the 2020 Democratic presidential nomination.

Sen. Cory Booker kneels alongside an attendee sitting in the back row just before he's introduced during a campaign event at the RiverCenter in Davenport, Sunday, March 17, 2019.

Marc Kover of Washington, Iowa, stands outside of the RED Berry Café in Muscatine with a sign in support of Sen. Kirsten Gillibrand after seeing her speak, Wednesday, March 20, 2019. Kover is a registered republican who is says he'll consider supporting a Democratic candidate.

Potential voters watch out a window from the living room as former Texas congressman Beto O'Rourke shakes hands with guests in the front lawn before a meet and greet in Muscatine, Thursday, March 14, 2019.

California Sen. Kamala Harris, a Democratic presidential hopeful, is introduced by Iowa State Rep. Phyllis Thede during a town hall at the Waterfront Convention Center in Bettendorf, Sunday, Feb. 24, 2019.

Vietnam veteran Mike Martin of Davenport wipes a tear from his eye as Sen. Amy Klobuchar speaks about her experiences working with the late Sen. John McCain during a meet and greet at Hickory Garden Family Restaurant in Davenport, Sunday, March 17, 2019.

Rock Island alderman Virgil Mayberry, 2nd ward, holds sign in support of California Sen. Kamala Harris, a Democratic presidential hopeful, during a town hall at the Waterfront Convention Center in Bettendorf, Sunday, Feb. 24, 2019.

Mayor Pete Buttigeig reaches to turn off a fan after almost hitting his head while speaking during a meet and greet at Brew in the Village in Davenport, Monday, March 4, 2019.

Seen from a detached garage, presidential hopeful Cory Booker speaks to gathered democrats at a backyard party in Muscatine, Saturday, May 25, 2019.

Presidential hopeful John Hickenlooper, the former governor of Colorado, talks with reporters in front of Mary’s on 2nd in Davenport, Saturday, May 11, 2019.

Sen. Kirsten Gillibrand speaks at the RED Berry Café in Muscatine, Wednesday, March 20, 2019.

Sen. Amy Klobuchar shakes hands with attendees as she arrives at a meet and greet at Hickory Garden Family Restaurant in Davenport, Sunday, March 17, 2019.

Former Vice President and Democratic presidential hopeful Joe Biden speaks during a campaign event at Clinton Community College in Clinton, Wednesday, June 12, 2019.

Former Texas congressman Beto O'Rourke speaks to a packed crowd during a meet and greet in Muscatine, Thursday, March 14, 2019. Beto announced Thursday that he will run for the 2020 Democratic presidential nomination.

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