In a memo and video released Thursday morning, the Obama campaign is stressing Paul Ryan's "methods of misrepresentation" on a range of issues -- from his marathon time to Medicare -- ahead of the vice presidential debate Thursday evening.

"[A]s we've already seen in everything from his fact-free convention speech to his exaggerated marathon time, Ryan isn't afraid to skirt the truth," Stephanie Cutter, deputy campaign manager, writes in the memo.