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Romney now leads the GOP field in Washington with 37 percent, followed by Santorum at 32 percent, Ron Paul at 16 percent and Newt Gingrich at 13 percent.
 
Santorum had a double-digit lead in the same poll two weeks ago, leading 38 percent to 27 over Romney.
 
The Washington caucuses will take place on Saturday, three days ahead of the critical 10-state March 6 Super Tuesday contests.
 
Romney has posted gains across the board in the run-up to Super Tuesday, opening up a double-digit lead nationally and pulling to within the margin of error of Santorum in Ohio, seen as the biggest prize of the day.
 
Santorum also had led polls in Michigan, where he hoped to deliver a crushing blow to Romney in his home state. But Santorum ended up losing, and it appears his momentum has been sapped.
 
Santorum’s favorability rating has taken a hit in Ohio since he shot to the top of the polls following his surprising three-state caucus sweep of Colorado, Minnesota and Missouri.
 
At the time, 69 percent told PPP they approved of Santorum, versus only 18 percent who disapproved. Now 61 percent say they approve of him, versus 31 percent who disapprove.
 
The Mormon vote appears to be buoying Romney in Washington.
 
PPP estimates that 14 percent of caucus-goers will be Mormon, and 64 percent of those favor Romney.
 
Santorum still leads in the big three conservative categories of evangelicals, 41 percent to 30 percent; Tea Party supporters, 41 percent to 34; and the “very conservative,” 38 percent to 35, but his lead in those categories isn’t big enough to carry him to victory.
 
Santorum is the only candidate who has proven capable of winning caucus-style elections, taking all four contests to date.