Cowgirl has them:

Tester’s job approval is 50-26 whereas Dennis Rehberg’s is 41-34. There is a large swath of voters who say they have not decided. Strangely, Obama, in this same poll, is at 42-48, numbers that comport with polls we’ve seen in the press the last year or so. But it means that while Obama’s negatives are high in Montana (predictably so), his positive job approval is higher is than Rehberg’s. This is somewhat surprising. (emphasis mine)

I have never figured out what Montanans see in Rehberg- he’s not a leader, he’s never out in front of an issue- the exact opposite of Tester. Cowgirl again:

Rehberg doesn’t seem to really do anything in his job. He provides nothing beyond criticism of democrats in the form of regurgitated FoxNews talking points, whereas Tester is visibly active, always, and active on issues that resonate within important sectors of the electorate.

Exactly. Full story here.