<Tr> <Td> July 22, 1937--January 3, 1939 </Td> <Td> Alben W. Barkley </Td> </Tr> <Tr> <Td> 76th </Td> <Td> January 3, 1939--April 9, 1939 </Td> </Tr> <Tr> <Td> April 9, 1939--January 3, 1940 </Td> <Td> Sherman Minton </Td> </Tr> <Tr> <Td> January 3, 1940--January 3, 1941 </Td> <Td> Warren Austin Acting </Td> </Tr>

Who are the party whips of the senate