US visit: What's on itinerary for leaders' wives?

While the Prime Minister and US President have been talking up the special relationship between the the UK and United States, Michelle Obama and Samantha Cameron have been cementing an itinerary as carefully choreographed as their husbands'.

On Tuesday night they hosted a mini-Olympic competition at the American University in Washington DC, and seemingly left a number of inspired school children in their wake.

The BBC's Laura Trevelyan reports.