TV highlights: 'Parks and Recreation' hits D.C. and meets up with Sen. McCain (again)

(All times Eastern) On what's promised to be one of the most celeb-packed "Parks and Recreation" (NBC at 8 p.m.) episodes to date, Leslie and April make their final trek to Washington, where they meet Sen. John McCain (R-Ariz.), Sen. Kirsten Gillibrand (D-N.Y.), Sen. Cory Booker (D-N.J.) and many others.