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 AyotteOPINION: Democracy will send ISIS to the same grave as communism Kelly Ayotte joins defense contractor's board of directors Week ahead: Comey firing dominates Washington MORE (N.H.), Sen. Rob PortmanRob PortmanRegulatory experts push Senate leaders for regulatory reform Conservative group to give GOP healthcare holdouts ‘Freedom Traitors Award’ Source: Senate leaders to offer 0 billion to win over moderates MORE (Ohio), Louisiana Gov. Bobby Jindal and Virginia Gov. Bob McDonnell. Florida Rep. Connie Mack, who will face Sen. Bill NelsonBill NelsonGore wishes Mikulski a happy birthday at 'Inconvenient Sequel' premiere Honda recalls 1.2 million cars over battery fires Vulnerable senators raise big money ahead of 2018 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 RubioBush ethics lawyer: Congress must tell Trump not to fire Mueller The private alternative to the National Flood Insurance Program  Cruz offers bill to weaken labor board's power MORE (R) will introduce Romney before the presumptive nominee's own speech at the convention.