Vilsack?

The buzz is that the mystery candidate to challenge Chuck Grassley may be Vilsack -- Christie not Tom. Since he has been in the Senate, Grassley has not had a credible challenger.Christie Vilsack would be another story.

Vilsack is certainly someone that Democrats would rally around. She would be a credible candidate with access to organization, staff and money.In a year when Grassley has faced some criticism from within Republican circles, this seems like an ideal time for Vilsack to enter the race.

Further, a popular, high-profile Demoratic senate candidate might be just what the Big Lug ordered. With his poll numbers slipping, Vilsack might be able to drive turnout to bolster Culver's re-election chances.

2010 is shaping up to be quite a year.