FILE - This June 26, 2012 file photo shows, from left, Sen. John McCain, R-Ariz., Sen. Saxby Chambliss, R-Ga., vice chair of the Senate Intelligence Committee, and Sen. John Cornyn, R-Texas, during a news conference on Capitol Hill in Washington. Chambliss announced Friday, Jan. 25, 2013, he will not seek a third term next year, saying "this is about frustration" with Washington gridlock that he doesn't see changing in a divided government. (AP Photo/J. Scott Applewhite, File)

Associated Press
FILE - This June 26, 2012 file photo shows, from left, Sen. John McCain, R-Ariz., Sen. Saxby Chambliss, R-Ga., vice chair of the Senate Intelligence Committee, and Sen. John Cornyn, R-Texas, during a news conference on Capitol Hill in Washington. Chambliss announced Friday, Jan. 25, 2013, he will not seek a third term next year, saying "this is about frustration" with Washington gridlock that he doesn't see changing in a divided government. (AP Photo/J. Scott Applewhite, File)
FILE - This June 26, 2012 file photo shows, from left, Sen. John McCain, R-Ariz., Sen. Saxby Chambliss, R-Ga., vice chair of the Senate Intelligence Committee, and Sen. John Cornyn, R-Texas, during a news conference on Capitol Hill in Washington. Chambliss announced Friday, Jan. 25, 2013, he will not seek a third term next year, saying "this is about frustration" with Washington gridlock that he doesn't see changing in a divided government. (AP Photo/J. Scott Applewhite, File)
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