Volunteers battle for votes in US swing states

As the US presidential race hots up, both candidates will be pouring time and money into the so-called "swing states" - where Democratic and Republican voting blocs are evenly matched, with slim margins of independent voters likely to make the difference. Volunteers are now going door to door in these crucial battlegrounds, trying to sway undecided voters towards their candidate. Bryan Quinn and our colleagues at France Televisions have this report.