The Biggest Loser by Dave Bjerke/NBC Photo The Biggest Loser by Dave Bjerke/NBC Photo

Tuesday's highlights:

" American Idol delivered 29.05 million total viewers, a year-over-year dip of six percent.

" Averaging 8.94 mil over its two-hour run, The Biggest Loser was up 25 percent week-to-week.

" One Tree Hill scored 3.05 mil, an 11 percent increase.

" At 10 o'clock, SVU served up 12.97 mil (up 830K), while Boston Legal (8.24 mil) gained 340 thou.

In other ratings news, CNN's coverage of Monday night's Democratic presidential debate was the most-watched primary face-off in cable TV history, registering 4.9 million viewers.... AMC's Breaking Bad on Sunday debuted to 1.35 million. Comparatively, the cabler's Mad Men drew 1.65 mil in its pwn premiere.