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WASHINGTON, DC - NOVEMBER 20: Sen. John McCain (R-AZ) questions a witness during a hearing of the Permanent Subcommittee on Investigations of the Senate Homeland Security and Governmental Affairs Committee November 20, 2014 in Washington, DC. The committee heard testimony on the topic of 'Wall Street Bank Involvement With Physical Commodities.' (Photo by Win McNamee/Getty Images)
WASHINGTON, DC - NOVEMBER 20: Sen. John McCain (R-AZ) questions a witness during a hearing of the Permanent Subcommittee on Investigations of the Senate Homeland Security and Governmental Affairs Committee November 20, 2014 in Washington, DC. The committee heard testimony on the topic of 'Wall Street Bank Involvement With Physical Commodities.' (Photo by Win McNamee/Getty Images)

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    McCain announces another run at 78

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McCain announces another run at 78

John King, Lisa Lerer and Robert Costa on the Arizona senator, who will be 80 years old when he runs for another Senate term in 2016.

McCain announces another run at 78

John King, Lisa Lerer and Robert Costa on the Arizona senator, who will be 80 years old when he runs for another Senate term in 2016.