Clinton's not-so-secret weapon in Arizona: Michelle Obama

The US presidential candidates are zigzagging across the US, in pursuit of every last vote before Election Day.

But it's not just Hillary Clinton and Donald Trump out on the trail.

The Clinton campaign has sent First Lady Michelle Obama to key locations. On Thursday that included Arizona - a state which traditionally votes Republican - but where Democrats see an opening this time.

The BBC's Rajini Vaidyanathan is there.