"I could not be more excited to have my friends Gabby Giffords and Mark Kelly come to Iowa for Bruce, Blues, and BBQ," Braley says in a statement. "Gabby and Mark have made it their life's mission to bring people together and find common sense solutions that solve some of the tough problems facing our country. I work hard every day to live by their example, and I hope to bring that same spirit to the US Senate."

Braley is all but certain to be the Democratic nominee for retiring Sen. Tom HarkinThomas (Tom) Richard HarkinOrrin Hatch, ‘a tough old bird,’ got a lot done in the Senate Democrats are all talk when it comes to DC statehood The Hill's 12:30 Report MORE's (D-Iowa) seat. The GOP has yet to settle on a candidate in the swing state; all of the state's high-profile Republicans passed on the race, and there are a number of lesser-known Republicans running for the seat, allowing Braley to build up a big war chest for the general election.