What we're watching tonight:
- CW (1080i) has 90210 at 8 p.m. and Privileged at 9 p.m.
- ABC Family (720p) has Lincoln Heights at 8 p.m. and Greek at 9 p.m.
- CBS (1080i) airs NCIS at 8 p.m.
- ABC (720p) brings home Dancing With the Stars at 8 p.m.
- ABC, CBS, Fox, NBC, CNN, PBS have the Presidential Debate at 9 p.m.
- Discovery (1080i) has Dirty Jobs at 9 p.m.
- Sci Fi (1080i) drops in ECW at 9 p.m.
- A&E (720p) has The Cleaner at 10 p.m.
- ESPN2 (720p) has Troy/Florida Atlantic college football at 8 p.m.