After months of volatility, Mitt Romney and Ron Paul remain the front-runners in Iowa for the third week in a row with the state’s Republican caucus just five days away.

The latest Rasmussen Reports telephone survey of likely GOP caucus participants finds Romney with 23% support to Paul’s 22%. Former U.S. Senator Rick Santorum has moved into third place with 16%, his best showing to date, closely followed by former House Speaker Newt Gingrich and Texas Governor Rick Perry who earn 13% of the vote each.

This Iowa survey of 750 Likely Republican Caucus Participants was conducted on December 28, 2011 by Rasmussen Reports. The margin of sampling error is +/- 4 percentage points with a 95% level of confidence. Field work for all Rasmussen Reports surveys is conducted by Pulse Opinion Research, LLC. See methodology.