Puh-leeze.
There were never any viable conservative candidates in the running for the nomination, and the ones who are the most conservative are THE MOST unpopular. If you don't think the Republican party has left conservatives, then perhaps that's because you are not a conservative.
Perhaps you are full of crap.
There is absolutely no logic whatsoever to your statement.
You concede that there are Republican candidates in the race who are conservative.
So how the hell did the Party leave conservatives?
Maybe voters have left conservatism, but that has nothing to do with the party.