It’s safe to say Joe Biden’s been having a great week — he celebrated his 70th birthday Tuesday, just four days after he made a primetime splash on NBC’s Parks & Recreation. There was little doubt it completed the life of Leslie Knope, played by Amy Poehler, but on the Late Show we finally got to learn how smitten Poehler, as an actress, felt. Not one to be outdone by the vice president, Letterman tried to one-up Biden, and Poehler started her collection of smooches from silver foxes.