Seems that during such a long time in the Senate, the party would have eventually stopped supporting him if they didn't feel he sufficiently represented their views...but no, they kept on sending him there....although 2004 was certainly the first indication of that changing.
I'd say the change was obvious right after he got re-elected.
I would agree except it seems like he's gone out of his way with every vote and media statement to piss people off. Doesn't matter if it's EFCA, the Stimulus, Immigration, whatever. I know some Republicans are insane but it doesn't really look like he even bothered trying to reach out or salvage things.
Of course he's doing what's in his best interest (at least seemingly), but the spin is insulting nonetheless.