<Tr> <Td> January 3, 1952--January 3, 1953 </Td> <Td> Styles Bridges </Td> </Tr> <Tr> <Td> 83rd </Td> <Td> January 3, 1953--July 31, 1953 </Td> <Td> Earle Clements </Td> <Td> Lyndon B. Johnson </Td> <Td> Republican Majority → </Td> <Td> Robert A. Taft </Td> </Tr> <Tr> <Td> August 3, 1953--January 3, 1955 </Td> <Td> William F. Knowland </Td> </Tr> <Tr> <Td> 84th </Td> <Td> January 3, 1955--January 3, 1957 </Td> <Td> Democratic ← Majority </Td> </Tr>

Who is the main leader of the senate