Hmm, fair enough. I agree that there is a misconception regarding Montana as a heavily Republican state. Having said that, I also think that Tester could be vulnerable. I mean, in a heavily Democratic year (in an apparently balanced state), Tester only managed to beat the old, senile, crook by 3000 votes. A good GOP candidate could put Tester away.
I wasn't disagreeing with the notion that Tester could potentially be a vulnerable target in 2006 since he's evidently more liberal than the state as a whole (though that hasn't stopped other senators from being re-elected); I was only dispelling the notion that Montana is a heavily Republican state (or even a Republican state at all).