Primetime Preview: Barack and The Bachelor

What should you set your TiVo for tonight? And what should you say Ti-NO to?

Our staff combs through this evening's television listings and helps readers set their viewing schedules:

• 8:00 p.m. Barack Obama holds a primetime press conference.
• 8:30 p.m. Does Barney have a girlfriend on How I Met Your Mother (CBS)?
• 9:00 p.m. The hour of 3-4 p.m. on 24 (Fox); Volume four continues on Heroes (NBC).
• 10:00 p.m. Diddy - yes, Diddy - guest stars on CSI: Miami (CBS).

Claire and company are on the run tonight on Heroes.