<Tr> <Td> Public Policy Polling </Td> <Td> 865 </Td> <Td> September 22--25, 2017 </Td> <Td> ± 3.3% </Td> <Td> 41% </Td> <Td> 51% </Td> <Td> 9% </Td> </Tr> <Dl> <Dt> Trump vs. Sanders </Dt> </Dl> <Dt> Trump vs. Sanders </Dt> <Table> <Tr> <Th> Poll source </Th> <Th> Sample size </Th> <Th> Date (s) </Th> <Th> Margin of error </Th> <Td> Donald Trump </Td> <Td> Bernie Sanders </Td> <Td> Undecided </Td> </Tr> <Tr> <Td> Public Policy Polling </Td> <Td> 865 </Td> <Td> September 22--25, 2017 </Td> <Td> ± 3.3% </Td> <Td> 40% </Td> <Td> 51% </Td> <Td> 9% </Td> </Tr> <Tr> <Td> Public Policy Polling </Td> <Td> 887 </Td> <Td> August 18--21, 2017 </Td> <Td> ± 3.3% </Td> <Td> 38% </Td> <Td> 51% </Td> <Td> 11% </Td> </Tr> <Tr> <Td> Public Policy Polling </Td> <Td> 692 </Td> <Td> July 14--17, 2017 </Td> <Td> ± 3.7% </Td> <Td> 39% </Td> <Td> 52% </Td> <Td> 9% </Td> </Tr> <Tr> <Td> Public Policy Polling </Td> <Td> 692 </Td> <Td> June 9--11, 2017 </Td> <Td> ± 3.7% </Td> <Td> 41% </Td> <Td> 51% </Td> <Td> 8% </Td> </Tr> <Tr> <Td> Public Policy Polling </Td> <Td> 692 </Td> <Td> May 12--14, 2017 </Td> <Td> ± 3.7% </Td> <Td> 39% </Td> <Td> 52% </Td> <Td> 9% </Td> </Tr> <Tr> <Td> Public Policy Polling </Td> <Td> 648 </Td> <Td> April 17--18, 2017 </Td> <Td> ± 3.9% </Td> <Td> 41% </Td> <Td> 50% </Td> <Td> 8% </Td> </Tr> <Tr> <Td> Public Policy Polling </Td> <Td> 677 </Td> <Td> March 27--28, 2017 </Td> <Td> ± 3.8% </Td> <Td> 41% </Td> <Td> 52% </Td> <Td> 7% </Td> </Tr> </Table>

Who is going to run for president in 2020