Live from New York, it's... Molly Shannon!Sketches include "Mary Katherine Gallagher on American Idol," "Urigro," "Penelope at the Tenants' Meeting," "The Fringe Candidates Debate," "Sally O'Malley on The Sopranos," "Kaitlin at the Nursing Home," "MacGruber" (three parts), "The Legend of Big-Boobed Einstein" (cartoon), "Charli Coffee," and "Trump Steaks."Linkin Park performed "What I&#