You might be surprised at who polls show is the least popular senator

Sen. John McCain, R-Ariz., leaves the chamber just after President Barack Obama's choice to head the Justice Department's civil rights division failed a Senate test vote and put the confirmation of Debo Adegbile in jeopardy, at the Capitol in Washington, Wednesday, March 5, 2014. (AP Photo/J. Scott Applewhite)

You might be surprised who is the least-popular senator

Sen. John McCain is the least-popular U.S. senator, according to a recent poll.The Arizona Republican has a 54 percent disapproval rating and just a 30 percent approval rating, according to a poll by North Carolina firm Public Policy Polling.To be fair, PPP has not surveyed every senator (although it has a good start), it is a Democratic firm and it uses automated methods, which some pollsters criticize.But regardless, it's clear that McCain has dropped significantly with voters since his 2008 …

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