Newt Gingrich. Photo: wiki commons.

CBS News – Newt Gingrich on Wednesday unofficially conceded the Republican presidential race to Mitt Romney, calling on conservatives to unite behind the presumptive nominee. Campaign aides said he would formally suspend his bid next week.

After Romney’s clean sweep of all five primaries on Tuesday–including Delaware, where Gingrich had staked the remainder of his tattered campaign–the former House speaker said in a speech to the Gaston County GOP that “it’s pretty clear Governor Romney is going to be the nominee.”

Read full story.