In a sign of Republican concern over Sen. Richard Burr's re-election chances, Burr's friend and Senate colleague, John McCain, is now running Google ads pumping the North Carolina freshman.

As first spotted by the Charlotte News and Observer, a Google search of "Richard Burr" brings up a sponsored link from McCain's Country First political action committee -- "Richard Burr NC Senator," it reads, followed by "Join John McCain's Country First to Support Candidates like Burr!"

The link leads to the PAC's Supported Candidates page.