The latest numbers from Rasmussen:

Longtime Senator John McCain continues to lead Arizona’s Republican Primary by double digits but remains in the same narrow range of support he’s drawn since January.

The latest Rasmussen Reports statewide telephone survey of Likely GOP Primary Voters in the state Voters shows McCain picking up 47% support, while challenger J.D.Hayworth earns the vote from 36%. Navy veteran and Tea Party activist Jim Deakin picks up seven percent (7%) support. One percent (1%) like another candidate in the race, and eight percent (8%) are undecided.

Any incumbent who earns less 50% support is considered potentially vulnerable, and McCain has been hovering around that mark all year. Since January, McCain’s support has fallen in a narrow 47% to 53% range. Hayworth's support has generally been in the low 40s.

That's pretty much what we predicted yesterday.

Hayworth has been able to keep McCain at below 50 percent even though he's had little money to spend and McCain has been hammering relentlessly for being a Washington insider and a lobbyist. Yes, after 28 years in Washington and two presidential runs, McCain now believes there's something wrong with being a Washington insider. (But remember, while he might not be an insider himself, he's certainly not a maverick.) And lobbyists are bad, too, except when they're working for you.

A Rasmussen disclaimer.