<Tr> <Th> Poll source </Th> <Th> Sample size </Th> <Th> Date (s) </Th> <Th> Margin of error </Th> <Td> Donald Trump </Td> <Td> Eric Holder </Td> <Td> Undecided </Td> </Tr> <Tr> <Td> Politico / Morning Consult </Td> <Td> 1,974 </Td> <Td> August 16--18, 2018 </Td> <Td> ± 2.0% </Td> <Td> 30% </Td> <Td> 24% </Td> <Td> 46% </Td> </Tr> <Dl> <Dt> Trump vs. Johnson </Dt> </Dl> <Dt> Trump vs. Johnson </Dt>

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