Best way for McCain to heal the breach with Conservatives is for him to go fight a big messy battle with Senate Democrats on spending or something to show he actually means what he says. He has time to do that while Hillary/Obama continue slugging it out.
Words are not enough. McCain’s record is against him. He needs to put up some solid deeds to match his rhetoric
...And the time is getting short, he needs to prove himself, otherwise he will be regarded as a RINO.