Ahead of the July 20 broadcast of Portlandia: The Brunch Special on IFC, Fred Armisen visited David Letterman last night and gave us a quick breakdown of his POTUS impression on SNL. Apparently, there's been an evolution in the impersonation. In addition to the regular solemn "Hello" and nod of reassurance, Obama's "been doing this other thing where he shows off his profile," Armisen explained. "And he's got such a great profile." What's not to show off? Watch the clip below.