Takes care of the everyday business of the senate. Usually is the senior member of the senate from the majority party. He/she is next in line for the presidency after the speaker of the house
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How many Republicans
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53
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President of the senate
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Mike Pence (republican from IN)
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Minority whip
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Dick Durbin (IL)
Makes sure party members vote the way the party leadership wants them to
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How many democrats
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47
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Majority whip
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John Thune (SD)
Makes sure party members vote the way the party leadership wants them to
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Majority leader
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Mitch McConnell (KY)
Spokesperson for their party. Takes care of scheduling legislative business
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Minority leader
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Charles "Chuck" Schumer (NY)
Spokesperson for their party. Takes care of scheduling legislative business