In the wake of her supposed "victory" in the first round of Democratic presidential debates, US Senator Kamala Harris rose from fifth place to a tie for third place (with fellow US Sen Elizabeth Warren) in a Morning Consult poll of her party's primary voters. Her gain came mainly at the expense of the front-runner, former vice-president Joe Biden. More interesting than Harris's sudden ascent is how she managed it: By ripping a page out of Donald Trump's 2016 campaign playbook.