College Basketball. NCAA tournament regional semifinals: George Mason vs. Wichita State (Channel 9, 7:25); Georgetown vs. Florida (Channel 9, 9:40).

White House Chronicle. CBC's Henry Champ, Proceso's Jesus Esquivel and Alec Russell of the Daily Telegraph preview President Bush's summit with Mexican President Vicente Fox and Canadian Prime Minister Stephen Harper (Channel 32 at 6).

The Politics Program With Mark Plotkin. John Feinstein, author of "Last Dance: Behind the Scenes at the Final Four," discusses the NCAA basketball tournament (NewsChannel 8 at 11 p.m.; heard live at 10 a.m. on WTOP (1500 AM and 107.7 FM).

20/20 looks into whether healthy menu options offered at large chain restaurants are good for you, and a segment on the asexual movement (Channel 7 at 10).

Cow Belles (2006). Singing sisters Alyson and Amanda Michalka (better known as Aly & AJ) star as spoiled girls forced by their dad to work in his dairy factory, where they wind up saving the business (Disney Channel at 8).

Hannah Montana. Miley Cyrus, daughter of country singer Billy Ray Cyrus, stars as a seemingly normal teen who lives a secret double life as a world famous pop star (Disney Channel, 9:30).

Real Time With Bill Maher. The roundtable guests are actor Jason Alexander, author Reza Aslan and Rep. Jack Kingston (R-Ga.), plus an interview with journalist Michael Ware (HBO at 11).

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