Barack Obama ended his last-minute campaign blitz through four states and returned to the White House to wait out tomorrow’s mid-term congressional election results.

Hillary Clinton adopted a sharper tone as she came face-to-face with Barack Obama in a bid to revive her ailing campaign for the Democratic Party’s presidential nomination, but never achieved a “knockout blow”, US political pundits said today.

Hillary Clinton and Barack Obama looked set to engage in a heated debate tonight as the former First Lady tried to get her presidential campaign back on track.