Mitt Romney, the supposed front-runner for the Republican presidential nomination, would be trounced in a head-to-head race against either of two yet unannounced GOP candidates, Rick Perry and Chris Christie, a new IBOPE Zogby/Newsmax poll reveals. In the survey of nearly 1,000 likely Republican primary voters, New Jersey Gov. Christie gets a resounding 62 percent of the vote to Romney’s 19 percent, with the remaining 19 percent not sure. Texas Gov. Perry gets 55 percent of the vote when matched against former Massachusetts Gov. Romney, who receives 22 percent, with 23 percent not sure.