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 AyotteStale, misguided, divisive: minimum wage can't win elections Trump voter fraud commission sets first meeting outside DC RNC chair warns: Republicans who refused to back Trump offer 'cautionary tale' MORE (N.H.), Sen. Rob PortmanRobert (Rob) Jones PortmanWeek ahead in tech: Debate over online sex trafficking bill heats up 'Hillbilly Elegy' author won't run for Senate Brown, Portman urge Trump administration to move quickly on a steel decision MORE (Ohio), Louisiana Gov. Bobby Jindal and Virginia Gov. Bob McDonnell. Florida Rep. Connie Mack, who will face Sen. Bill NelsonClarence (Bill) William NelsonDem asks airlines to cap airfares ahead of Hurricane Maria Trump encourages Rick Scott to run for Senate Overnight Regulation: House moves to block methane rule | Senators wrestle with allowing driverless trucks | EPA delays toxic waste rule 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 RubioOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Trump bets base will stick with him on immigration MORE (R) will introduce Romney before the presumptive nominee's own speech at the convention.