MANCHESTER, N.H. -- New Jersey Gov. Chris Christie's entry into the 2012 presidential race could dramatically reshape what has become a two-man race between Mitt Romney and Rick Perry. But Christie, who's under pressure from party elders to run, hasn't faced national scrutiny – and he could join other early favorites who burned out fast.The budget-cutting Christie is the latest heartthrob of Republicans who have been looking for a more exciting candidate than Romney.