[['state (class)', 'vacator', 'reason for change', 'successor', 'date of successors formal installation'], ['virginia (1)', 'vacant', 'failure to elect', 'isaac s pennybacker ( d )', 'elected december 3 , 1845'], ['massachusetts (2)', 'isaac c bates ( w )', 'died march 16 , 1845', 'john davis ( w )', 'elected march 24 , 1845'], ['new hampshire (2)', 'benning w jenness ( d )', 'resigned june 13 , 1846 after successor elected', 'joseph cilley ( d )', 'elected june 13 , 1846'], ['south carolina (3)', 'george mcduffie ( d )', 'resigned august 17 , 1846', 'andrew butler ( d )', 'elected december 4 , 1846'], ['iowa (2)', 'iowa admitted to the union december 28 , 1846', 'iowa admitted to the union december 28 , 1846', 'vacant', 'not filled this term'], ['iowa (3)', 'iowa admitted to the union december 28 , 1846', 'iowa admitted to the union december 28 , 1846', 'vacant', 'not filled this term'], ['louisiana (2)', 'alexander barrow ( w )', 'died december 29 , 1846', 'pierre soulã ( d )', 'elected january 21 , 1847']]
Alexander Barrow ( W ) Died on December 29 , 1846 while Isaac C Bates ( W ) Died on March 16 , 1845
[ENT] [ENT] on [ENT] while [ENT] [ENT] on [ENT]