You are right in that it would be wrong to punish conservative Republican lawmakers with the bad votes of a few RINOs. So I can safely vote my Congressman (Lamar Smith), he's a conservative.
But what of the poor conservative voter in Ohio, who has a choice between RINO-ish Mike DeWine, who at least votes conservative most of the time, but a waffling RINO on too many issues, and a liberal Democrat?
DeWine was a vote for Alito, Roberts and other Judges ... but isnt he also part of that cabal of 14 that helped 'compromise' the Republicans out of a showdown on Judges?
The RINO incumbents are very hard to dislodge in primaries (see Specter in 2004), and have to supported in November since the alternative is horrifying (another Hillary clone). Yet the result is that the RINOs are the swing vote in the Senate, a key factor in the Senate's high 'wimpout' rate. ugggg
There is a leadership void in the house (after Delay stepped down) and in the Senate (Limp Frist) which is part of the reason the "gang" was able to soak up some media attention for awhile.