Sen. Angus King, I-Maine, heads to the Senate floor for a roll call vote at the Capitol in Washington, in this Jan. 12, 2015, file photo. (AP Photo/J. Scott Applewhite, File)
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Sen. Angus King, I-Maine, heads to the Senate floor for a roll call vote at the Capitol in Washington, in this Jan. 12, 2015, file photo. (AP Photo/J. Scott Applewhite, File)
