epa01527288 (FILE) A file picture dated 03 June 2008 shows Michelle Obama (L) giving her husband, Democratic presidential candidate US Senator Barack Obama, a knuckle-bump as a sign of support before he speaks to supporters at the Xcel Center in St . Paul, Minnesota, USA. On 04 November 2008, Democratic Party presidential candidate Barack Obama will compete with Republican Party presidential candidate John McCain in the US presidential elections. EPA/CRAIG LASSIG