AMANPOUR (voice-over): This week -- the fighting front-runner. Newt Gingrich, target of the night at the ABC News debate in Iowa. Taking hits.
FORMER GOV. MITT ROMNEY (R-MA.,), PRESIDENTIAL CANDIDATE: We need people from outside Washington, outside K Street.
AMANPOUR: And returning fire.
FORMER REP. NEWT GINGRICH (R-GA.), PRESIDENTIAL CANDIDATE: The only reason you didn't become a career politician is you lost to Teddy Kennedy in 1994.
AMANPOUR: Under pressure, Mitt Romney...Full Story