Take a glimpse at the GOP candidates vying for the chance to challenge President Barack Obama in the 2012 election.
President Barack Obama is running for re-election. Who will challenge him for the presidency?
Former House Speaker Newt Gingrich formally announced his candidacy on May 11. Gingrich made the big announcement on Twitter and Facebook.
Texas Rep. Ron Paul, a libertarian hero and longtime critic of America's foreign policy, has also announced he's in the race. It's Paul's third bid for the White House.
Former Massachusetts Gov. Mitt Romney launched his second bid for the White House in June, and has consistently ranked high in polls on 2012 GOP contenders.
Former Pennsylvania Sen. Rick Santorum formally announced his presidential bid on June 6.
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