Representative Matt Salmon

AZ POLL: Sen. McCain Under 50 Percent, Extraordinarily Vulnerable

Five-term incumbent Sen. John McCain may have reason to fear a primary challenge. Newly released data from liberal-leaning Public Policy Polling shows half of Arizona’s Republican primary voters disapprove of McCain’s job performance, and more than half would prefer a more conservative Senate candidate in 2016.

REUTERS/RUBEN SPRICH