Majority advantage in Senate seats up for re-election, 1790 – 2018 – Conservative Partnership Institute Year Majority Seats Up Minority Seats Up MajorityAdvantage 2018 6 26 20 2008 12 23 11 1954 12 20 8 1898 11 19 8 1928 12 19 7 1982 13 19 6 1952 13 19 6 1972 14 19 5 2004 15 19 4 1896 13 17 4 1882 11 15 4 1934 14 17 3 1884 11 14 3 1846 8 11 3 1842 7 10 3 1836 7...
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