Angus King

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US Sen. Angus King, left, speaks Monday, Aug. 18, 2014 in Portland, Maine, during an event where he endorsed independent Eliot Cutler, right, for Maine governor. King said there would be "significant advantages" to having an independent governor who could make the best appointments, regardless of party affiliation. (AP Photo/Joel Page)

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FILE - Following a meeting with Sen.-elect Angus King of Maine, right, Sen. Susan Collins, R-Maine, tells reporters that she wants answers from disgraced CIA Director David Petraeus, in this Tuesday, Nov. 13, 2012 file photo. Independent U.S. Sen. Angus King may caucus with Democrats but he's endorsing Republican colleague Susan Collins in her bid for a fourth term in the Senate. The two are to appear together Friday May 16, 2014 at the Margaret Chase Smith Library in Skowhegan. (AP Photo/J. Scott Applewhite, File)

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** FILE ** Sen. Angus King, I-Maine, pauses during an interview with The Associated Press, Friday, May 3, 2013, in Portland, Maine. (AP Photo/Robert F. Bukaty)

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Senate Majority Leader Harry Reid (right), Nevada Democrat, talks Nov. 14, 2012, on Capitol Hill in Washington with Independent Sen.-elect Angus King of Maine. (Associated Press)

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Sen. Susan Collins, Maine Republican, meets Nov. 13, 2012, with Independent Senator-elect Angus King in her office on Capitol Hill in Washington to discuss committee assignments and how they'll work together to represent Maine in the Senate. (Associated Press)