Against mostly atypical competition, CBS’ regular Monday lineup dominated every half-hour in its return to originals last night after a week of repeats. ABC’s Dancing With The Stars, a huge draw among total viewers, sucks out (mostly older) audiences from the competition. As they didn’t face Dancing with originals for the first time this season, CBS’ comedies boosted their viewership. How I Met Your Mother (4.5/12 in adults 18-49, 11.7 million total viewers) was up a tenth in the demo vs. two weeks ago and drew its largest audience with a regularly scheduled episode in almost three years. (since January 12, 2009).