Hanover, New Hampshire (CNN) -- Herman Cain, the latest Republican presidential candidate to surge in the polls, found himself in the hot seat Tuesday night at a debate in New Hampshire centered on economic matters. The linchpin of Cain's campaign, his cleverly titled 9-9-9 plan to restructure the U.S. Tax Code, came under harsh scrutiny as other Republicans sought to knock the former Godfather's Pizza CEO off his pedestal. The Cain plan would implement a 9% corporate income tax rate, a 9% income tax rate and a 9% national sales tax. His opponents called the plan unrealistic and said it stands zero chance of passing on Capitol Hill.
@highlight
NEW: Rick Perry says Mitt Romney's health plan in Massachusetts mirrors Obama's
@highlight
NEW: Romney turns attack on Perry, citing number of uninsured in Texas
@highlight
Candidates pounce on Herman Cain's 9-9-9 plan for eradicating tax code
@highlight
Cain defends plan as "bold solution"
Rick Perry pressed Romney on his health care overhaul in Massachusetts, which he compared to @placeholder's national plan.