Freshman U.S. Rep. Tim Walz, a Democrat serving southern Minnesota, says there is no way he will challenge U.S. Sen. Norm Coleman next year.

"No means no," he said, reacting to repeated rumors that he will enter the race against Democrats Al Franken, Mike Ciresi and others.

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But, Walz said, he understands why people ask him: "There is somewhat of a concern right now that none of our candidates have won a federal race."

"The frustration with Sen. Coleman is almost so thick you can almost cut it with a knife," he added.

Coleman is a first-term Republican who sits atop national Democrats' hit list for 2008.