The latest data out of Arizona has both McCain and Romney at 36 percent. That won't hold, but Romney may make it closer than just about anyone thought.
Update (10:10pm): Exits now show McCain ahead, by single digits.
Update (10:40pm): Called for McCain.
Update (10:59pm): Looks like the exit polls here were way off; McCain's winning the actual vote by 20 points. Mark Hemingway in The Corner reports a McCain staffer's reaction: "'[Oedipal expletive redacted] exit polls!'"