• CNN’s The Situation Room (7pmET): CNN will extend The Situation Room for an hour beginning at 7pmET and cover President Obama’s town hall meeting in California live. “Campbell Brown: No Bias. No Bull.” begins at 8pmET. Also — MSNBC’s Hardball will be live at 7pmET for the town hall.

• FNC’s Hannity (9pmET): Phil Donahue will be a guest. The former syndicated daytime and MSNBC show host will face off with Sean on health care and more.

• Discovery Channel (10pmET): Tom Brokaw revisits the climate change issue in “Global Warming: The New Challenge, With Tom Brokaw.” It’s Brokaw’s second documentary on the issue.

• NBC’s The Tonight Show (11:35pmET): Countdown host Keith Olbermann will be a guest of Jay Leno’s tonight.