Joe Biden has sent an email to supporters asking for donations and explaining the promise he made to President Obama going into tonight's debate in Danville, KY.
I told Barack I have one mission tonight: tell the truth and stand up for what we believe in.
Our side is always going to win when we do that.
But, Katie, take a look at what we're up against this week:
-- It's one of the last four weeks we have remaining.