floor, is the mansfield room, named for montana s mike mansfield, a democrat who served in the senate from 1953 to 1977 and was the single most admired majority leader of the united states senate in history. was illiterate leader of united states senate from 1961 till 1977. he is the senate majority leader who passed the civil rights act. he is the senate majority leader who passed the voting rights act. and mike mansfield never had to worry about his three reelection campaigns in montana, where he was as popular and as respected as he was in the united states senate. jon tester now occupies mike mansfield s seat in the united states senate. in his to reelection campaigns have each been a political miracle of sort, a democrat being reelected in the stout state that votes overwhelmingly