the chart above shows the latest National polling averages Ms Harris has the support of enough delegates to the Democratic National Convention to win the nomination she will have little time to Define herself to voters en counter Mr Trump's campaign Mr Biden's presidency has been associated with high inflation big industrial policy bills and turmoil abroad things which Republicans will seek to pin on Ms Harris too but she has one clear advantage over Mr Biden her age at 59 she is over two decades younger than he is and 18 years younger than Mr Trump