Sen. Norm Coleman (R-Minn.) leads his Democratic challenger Al FrankenAl FrankenDrug pricing order would cut regulations Dems push for more action on power grid cybersecurity Congress poised to prohibit airlines from forcibly removing customers MORE in a new Rasmussen poll.

Coleman, seeking a second term, is ahead 50 percent to 43 percent in the poll of likely Minnesota voters. The margin of error is 4.5 percent.

Previous Rasmussen surveys in February and March had the race within the margin of error. Eric Kleefeld of TPM Election Central suggested that Franken's failure to pay California taxes may have hurt him.