Sen. John McCain has slashed Rudy Giuliani's double-digit lead by 10 points, but the GOP picture gets muddier if former Sen. Fred Thompson or former House Speaker Newt Gingrich enters the race, according to a CNN poll gauging the popularity of 2008 presidential hopefuls.
Giuliani, the former New York mayor, had a healthy 16-point lead over the Arizona senator last month, but that has dwindled to six points -- that is, if either Thompson or Gingrich enters the race.
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