<Table> United States Senate elections, 2018 <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Td> ← 2016 </Td> <Td> November 6, 2018 </Td> <Td> 2020 → </Td> </Tr> </Table> </Td> </Tr> <Tr> <Th_colspan="2"> Class 1 (33 of the 100) seats in the United States Senate (and 2 special elections) 51 seats needed for a majority </Th> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Leader </Th> <Td> Mitch McConnell </Td> <Td> Chuck Schumer </Td> </Tr> <Tr> <Th> Party </Th> <Td> Republican </Td> <Td> Democratic </Td> </Tr> <Tr> <Th> Leader since </Th> <Td> January 3, 2007 </Td> <Td> January 3, 2017 </Td> </Tr> <Tr> <Th> Leader's seat </Th> <Td> Kentucky </Td> <Td> New York </Td> </Tr> <Tr> <Th> Current seats </Th> <Td> 51 </Td> <Td> 47 </Td> </Tr> <Tr> <Th> Seats needed </Th> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Seats up </Th> <Td> 9 </Td> <Td> 24 </Td> </Tr> <Tr> <Td_colspan="4"> </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Party </Th> <Td> Independent </Td> <Td> </Td> </Tr> <Tr> <Th> Current seats </Th> <Td> </Td> <Td> </Td> </Tr> <Tr> <Th> Seats up </Th> <Td> </Td> <Td> </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td_colspan="2"> Seats up for election (general & special): Democratic incumbent running Democratic incumbent retiring Republican incumbent running Republican incumbent retiring Independent incumbent running Independent incumbent retiring No election Inset rectangle signifies a special election . </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Td> Incumbent Majority Leader <P> Mitch McConnell Republican </P> </Td> <Td> <P> </P> </Td> </Tr> </Table> </Td> </Tr> </Table> <Tr> <Td_colspan="2"> <Table> <Tr> <Td> ← 2016 </Td> <Td> November 6, 2018 </Td> <Td> 2020 → </Td> </Tr> </Table> </Td> </Tr>

How many republicans are in the senate in 2018