You already have a far left "moderate" (aka a demonrat) at the top of the ticket. Add another moderate as the VP and they lose and the GOP, as we once knew it, is finished forever.
Weird. By definition, a moderate cannot be far left.
There are, of course, no conservatives. And no liberals. There are only people more conservative or more liberal than others.
Obama is more liberal than McCain. McCain is more conservative than Obama.