Former Democratic Rep. Artur Davis (Ala.) will speak at the Republican National Convention later this month in Tampa, Fla., the Republican National Committee (RNC) announced Thursday.

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Davis co-chaired President Obama's 2008 campaign and seconded his nomination at that year’s Democratic National Convention, but aligned himself with Republicans after losing a Democratic gubernatorial primary in 2010.

Davis campaigned with Mitt Romney on Wednesday in Virginia.

The RNC also announced speaking slots for four former potential vice presidential candidates: Sen. Kelly AyotteKelly Ann AyotteSinema, Gallagher fastest lawmakers in charity race New Hampshire senator to ask 2020 Dems to back repeal of state residency law Schultz recruiting GOP insiders ahead of possible 2020 bid MORE (N.H.), Sen. Rob PortmanRobert (Rob) Jones PortmanHouse votes to boost retirement savings The Hill's Morning Report - White House, Congress: Urgency of now around budget WANTED: A Republican with courage MORE (Ohio), Louisiana Gov. Bobby Jindal and Virginia Gov. Bob McDonnell. Florida Rep. Connie Mack, who will face Sen. Bill NelsonClarence (Bill) William NelsonRepublicans amp up attacks on Tlaib's Holocaust comments The muscle for digital payment Rubio says hackers penetrated Florida elections systems MORE (D-Fla.) in a bid for Senate later this year, will also speak.

“This exciting group of headliners includes two successful governors, two outstanding senators, the next senator from our convention state and a former co-chairman of the 2008 Obama campaign,” RNC Chairman Reince Priebus said in a statement. “The perspectives and ideas they bring to the convention stage will show all Americans that Romney and Ryan are the ticket to a better future. Former Congressman Davis especially will give voice to the frustration and disappointment felt among those who supported President Obama in 2008 and are now hungry for a new direction.”

New Jersey Gov. Chris Christie (R) will deliver the keynote address and freshman Florida Sen. Marco RubioMarco Antonio RubioFrustration boils over with Senate's 'legislative graveyard' Senate passes disaster aid bill after deal with Trump GOP senators work to get Trump on board with new disaster aid package MORE (R) will introduce Romney before the presumptive nominee's own speech at the convention.