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In page Margaret Chase Smith:

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She was defeated for re-election in 1972 by Democrat Bill Hathaway, the only election she ever lost in the state of Maine.[1] In her last election, Smith had been plagued by rumors of poor health (she had been using a motor scooter around the Senate). Her Republican primary challenger, attorney Robert A. G. Monks, taunted her for being out of touch; she did not have a state office operating in Maine.[citation needed] Smith lost the election by 27,230 votes, a margin of 53–47%.