McCain is not popular with conservatives, but those voters will support him over a liberal Democrat like Ann Kirkpatrick. If he survives the primary, his chances of losing reelection are about the same as Patty Murray's.
Why would they support John McCain over Ann Kirkpatrick? I thought that the Arizona Republicans were sick of him.
Yeah, that's why they will support a true conservative like Ann Kirkpatrick over that RINO McCain... give me a break.
Well, voting for a third party or just not voting at all are still options as well.
The combination of a few pissed off conservatives/libertarians being pissed off enough to vote for a third party or simply stay home plus the Democrats using Trump or Cruz as a dog whistle to up Hispanic and liberal turnout could very easily oust McCain.
Will it? Eh, I'm a pessimist, so probably not.