<Tr> <Td> Public Policy Polling </Td> <Td> 677 </Td> <Td> March 27--28, 2017 </Td> <Td> ± 3.8% </Td> <Td> 42% </Td> <Td> 45% </Td> <Td> 13% </Td> </Tr> <Dl> <Dt> Trump vs. Clinton </Dt> </Dl> <Dt> Trump vs. Clinton </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> Hillary Clinton </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> 42% </Td> <Td> 47% </Td> <Td> 11% </Td> </Tr> </Table>

When do you have to announce presidential candidacy