Is this John McCain's last stand?

The last thing the vulnerable Senate majority needs right now is adding another seat to the list that could flip the chamber to Democratic control in November.

But a new poll suggests one of the party's most solid re-election prospects and most veteran members could be in trouble.

John McCain, an Arizona Republican who has served in the senate for five terms, is facing a tough challenge from Democrat Ann Kirkpatrick, a new poll suggests.

McCain is "locked in a dead heat" with Kirkpatrick, according to a Rocky Mountain Poll released last week by the Behavioral Research Center.

The survey found McCain and Kirkpatrick captured 42 percent of the vote statewide, while 16 percent said they were undecided.