Mitt Romney has extended his lead in the Iowa Republican Presidential Caucus for 2008 and three candidates are virtually tied for second place.

The latest Rasmussen Reports telephone survey of the race shows Romney with support from 29% of Likely Caucus Participants. Trailing the frontrunner by thirteen percentage points is Mike Huckabee who enjoys support from 16%. In a virtual tie for second with Huckabee are Rudy Giuliani at 15% and Fred Thompson at 14%.