Ann Kirkpatrick Will Challenge John McCain in 2016

The election-hardened Arizona representative becomes the latest Democrat to try to gain an edge through shifting demographics.

Rep. Ann Kirkpatrick, D-Ariz., speaks at a news conference in Cannon Building to announce a legislative package that will help the Veterans Affairs Department eliminate the backlog of veteran's claims by 2015.

CQ Roll Call via AP Images

Arizona Representative Ann Kirkpatrick said Tuesday she will challenge Republican Senator John McCain in the 2016 election.

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