<Tr> <Th> Poll source </Th> <Th> Sample size </Th> <Th> Date (s) </Th> <Th> Margin of error </Th> <Td> Donald Trump </Td> <Td> Kamala Harris </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> 29% </Td> <Td> 26% </Td> <Td> 45% </Td> </Tr> <Tr> <Td> Public Policy Polling </Td> <Td> 679 </Td> <Td> June 8--10, 2018 </Td> <Td> ± 3.8% </Td> <Td> 40% </Td> <Td> 45% </Td> <Td> 15% </Td> </Tr> <Tr> <Td> Zogby Analytics </Td> <Td> 881 </Td> <Td> May 10--12, 2018 </Td> <Td> ± 3.2% </Td> <Td> 39% </Td> <Td> 35% </Td> <Td> 26% </Td> </Tr>

Who is going to win the next presidential election