<Tr> <Td> 1918 </Td> <Td> - 22: (214--> 192) </Td> <Td> - 4: (52--> 48) </Td> </Tr> <Tr> <Td> 1922 </Td> <Td> Warren Harding </Td> <Td> Republican </Td> <Td> - 77: (302--> 225) </Td> <Td> - 7: (60--> 53) </Td> </Tr> <Tr> <Td> 1926 </Td> <Td> Calvin Coolidge </Td> <Td> Republican </Td> <Td> - 9: (247--> 238) </Td> <Td> - 6: (56--> 50) </Td> </Tr> <Tr> <Td> 1930 </Td> <Td> Herbert Hoover </Td> <Td> Republican </Td> <Td> - 52: (270--> 218) </Td> <Td> - 6: (56--> 50) </Td> </Tr>

When do mid term election winners take office