Rasmussen released a new poll of Iowa’s U.S. Senate race yesterday, and they found Chuck Grassley in safe territory, leading Roxanne Conlin 59-31, Bob Krause 59-26 and Tom Fiegen 61-25.

Conlin performs best among Democratic voters, but all three Democrats lose anywhere from 22% to 30% of their own party’s vote to Grassley. The Republican carries voters not affiliated with either party by more than 35 points against any of the Democrats.

Rasmussen surveyed 500 “likely voters” in Iowa on January 26. The poll has a margin of error of 4.5 percent.

Even taking into account Rasmussen’s “house effect” (a tendency to show more favorable results for Republican candidates), Grassley is above 50 percent and therefore in safe territory for an incumbent. He is going to be re-elected unless he starts making unforced errors. In 2006, Senator George Allen of Virginia had commanding leads over Jim Webb for quite some time before multiple gaffes allowed Webb to win. Senator Jim Bunning of Kentucky almost blew a very big lead in 2004 against Dan Mongiardo.

Despite the long odds, it’s still worth taking the fight to Grassley. Iowa Democrats have given him a pass too many times. Under pressure, he may start making mistakes on the campaign trail. Even if he doesn’t, keeping him below 60 percent would be a lot better for down-ticket Democrats than letting Grassley win with 70 percent, as happened in 2004.

Share any thoughts about the Senate race in this thread.