Here are the latest figures from a June Harris Poll on Republican Candidates.
Although not officially a candidate former actor Fred Thompson is in second place overall and gaining momentum.
Rudy Giuliani - 30% (down from 39% in April)
Fred Thompson 22% (up from 13% in April)
John McCain 18% (the same as April and May)
Mitt Romney 11% (down from 14% in April)
Newt Gingrich 8% (not an official candidate either)
Tom Tancredo 3%
Sam Brownback 2%
Mike Huckabee 2%
Ron Paul 2%
Duncan Hunter 1%
Jim Gilmore 1%
Tommy Thompson 1%
Chuck Hagel 1% (not an official candidate)