If they cant move their numbers up within the GOP where do you think their numbers would be against Obama?
If numbers don't matter... heck... let's write in Alan Keyes. Now THAT'S a REAL conservative.
If Republican voters forgo voting for conservative candidates and instead surrender their votes to whichever candidate happens to be leading in the polls that particular week, then the Party as a whole has no prospects for leadership.
(Full disclosure: I voted for Keyes in 1996 and 2000)