Apart from a clear ideological preference for the Democrats, Obama is quite clearly the better candidate - calm, cool, not a hothead or erratic, a strategist rather than a tactician and a powerful orator.
He is quite clearly what the US and the world needs from this election.
He would also be (so far as I can tell) the first country in the developed world to elect a leader from a minority ethnic grouping, which given the US' troubled history with slavery, segregation and discrimination is important - again not just for the US but for the world.
It appears there has been some tightening in some states such as Pensylvania but if Obama doesn't win it will be the most incredible electoral upset (either that or the 'voting machines' are churning out Republican voting surpluses).
Either way, not long to wait now.