<Dl> <Dt> with generic Republican </Dt> </Dl> <Dt> with generic Republican </Dt> <Table> <Tr> <Th> Poll source </Th> <Th> Date (s) administered </Th> <Th> Sample size </Th> <Th> Margin of error </Th> <Th> Claire McCaskill (D) </Th> <Th> Generic Republican </Th> <Th> Undecided </Th> </Tr> <Tr> <Td> Fabrizo Lee (R) </Td> <Td> July 10--11, 2017 </Td> <Td> 500 </Td> <Td> ± 4.4% </Td> <Td> 38% </Td> <Td> 54% </Td> <Td> 8% </Td> </Tr> </Table> <Tr> <Th> Poll source </Th> <Th> Date (s) administered </Th> <Th> Sample size </Th> <Th> Margin of error </Th> <Th> Claire McCaskill (D) </Th> <Th> Generic Republican </Th> <Th> Undecided </Th> </Tr>

Who is running for midterm elections in missouri