Barack Obama actually said...

My belief is that, as a practical matter, it would be very difficult to execute.

I am absolutely convinced that the best thing we can do is to set a clear timetable, tell the Iraqis, 'We are going to start pulling out.'

I want to make sure that I get it right.

The vice presidency is the most important decision that I will make before I'm president. And it's something that I take very seriously.