In this Nov. 6, 2019, file photo, Sen. Susan Collins, R-Maine, is surrounded by reporters as she heads to vote at the Capitol in Washington. U.S. Sen. Collins officially launched her bid for a reelection Wednesday, Dec. 18, setting up an expensive and closely watched battle for the seat the moderate Republican from Maine has held for nearly 24 years. (AP Photo/J. Scott Applewhite, File)
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