During the Congressional election in the fall of 1866, Republicans gained even greater victories. This was due in large measure to the northern voter opposition that had developed toward President Johnson because of the inflexible and overbearing attitude he had exhibited in the White House, as well as his missteps during his 1866 speaking tour. Leading Radical Republicans in Congress included Massachusetts senator Charles Sumner (the same senator whom proslavery South Carolina representative Preston Brooks had thrashed with his cane in 1856 during the Bleeding Kansas crisis) and Pennsylvania representativeThaddeus Stevens.

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