I don't think it matters. If Hoffman wins, we all win because we have a real conservative in our House. If Hoffman loses the election, he will have received significant support to show true conservatives are here . . and we want a say in the GOP.
If the Dem wins, it is the same as if the liberal RINO wins. Same same.
The liberal RINO (better term is DIABLO -- Democrat In All But Label) would actually be worse. Not only will she vote with the Dems on every issue, she will give them "bipartisan" cover by doing so, AND she will have the seat tied up for the election in 2010 as the incumbent.