<Tr> <Td> American Research Group </Td> <Td> 1,365 </Td> <Td> March 21--27, 2018 </Td> <Td> ± 3.0% </Td> <Td> 39% </Td> <Td> 53% </Td> <Td> 8% </Td> </Tr> <P> Trump vs. Sanders </P> <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> American Research Group </Td> <Td> 1,365 </Td> <Td> March 21--27, 2018 </Td> <Td> ± 3.0% </Td> <Td> 49% </Td> <Td> 45% </Td> <Td> 5% </Td> </Tr> </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>

Who has announced they are running for president in 2020