European photopress agency Copyright: European photopress agency A rock star entrance for Michelle Obama Image caption: A rock star entrance for Michelle Obama

She has been dubbed Hillary Clinton’s secret weapon, a speaker who has the ability to reach voters in a way Mrs Clinton cannot. Watch her on stage in New Hampshire, and you can see why she has earned this moniker. Her impassioned and direct oratory has been used sparingly this campaign. She’s stumped for Mrs Clinton less than 10 times - but crucially all her speeches have been in swing states, and nearly all have been on college campuses.

This strategy is all part of an effort to mobilise millennial voters, many of whom backed Bernie Sanders in the primaries. This rally was packed with students from across the political spectrum, including a young Republican who told me he was disgusted by Donald Trump, but yet to be convinced by Hillary Clinton.

As Michelle Obama entered the room, the deafening screams were at the sort of ear-piercing level, usually reserved for rock stars. And it was to this backdrop, the first lady expressed her revulsion at Donald Trump’s comments about women, as heard on that recently released tape.

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