Like I said. If he was a weak leader, he should have been voted out long before now.
The "Republican" Senate old guard, along with the Senate RINOs, constituted a majority of Republicans in the Senate for as long as I can remember. They were, as far as I could tell by looking at the results, nearly as unhappy with the 1994 Revolution as Peter "Temper Tantrum" Jennings, and were quite happy when Jim Jeffords returned them to the obscurity (for the old guard)/impotence (for the RINOs) of the minority. Considering that, I doubt that any Senate Pubbie putsch would have even reached the one held against Newt Gingrich several years back, much less have been successful.
Whether that dynamic has changed with the 2002 elections in which President Bush invested so much personal political capital is anyone's guess. What I do know is that, along with the other tenents of Congressional power (oustide of the House Democrats), they didn't bother to wait for certified results and the possibility of a membership putsch before annointing themselves back to their leadership posts.