A new poll from Rasmussen shows Republican congressman Denny Rehberg leading his Democratic opponent, Senator Jon Tester, in the race for the U.S. Senate in Montana, 53 percent to 43 percent. This is Rehberg's widest lead yet.

Tester is considered perhaps the most endangered Democrat in 2012, particularly considering the unpopularity in Montana of Barack Obama, who will top the Democratic ticket in November. In a recent TV interview, Tester distanced himself from the president.

"The president isn't particularly doing well in a state like Montana," Tester said. "But this isn't about the presidential race. This is about a U.S. Senate race in Montana."

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