Tom Bergeron, Dancing With The Stars Tom Bergeron, Dancing With The Stars

Dancing With the Stars smoked the ratings competition Monday night, averaging 22.3 million viewers in its second week.

While the two-hour show tripped slightly in the advertiser-coveted 18-to-49-year-olds (down 4 percent to a 5.1 rating), its total audience was about the same as last week's 12th-season opener (though that was down from the 24.2 million who tuned in for last spring's debut).

Read our Dancing With the Stars recaps

Against Dancing in the first hour of Monday's prime time, a rerun of How I Met Your Mother and a fresh episode of Mad Love each pulled in some 5.6 million viewers on CBS; Fox's House drew 4.8 million. The NBC special All Together Now: A Celebration of Service, which saluted volunteerism in America and featured all the living past president as well as President Barack Obama, got 4.2 million, and a 90210 rerun only got 756,000 on the CW.

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At 9/8c, another Two and a Half Men repeat sank to 7.6 million viewers (compared with 9.1 million viewers last week). A rerun of Fox's The Chicago Code totaled nearly 4 million, and a repeat of CW's Gossip Girl drew 537,000, while at 9:30, a repeat of CBS' Mike & Molly  got 7 million (compared with last week's 9.6 million). The Event on NBC drew 4.4 million viewers.

Castle continued to reap Dancing's lead-in in prime time's final hour, dominating with some 12.8 million people, while Harry's Law matched last week's audience of 8.2 million and a rerun of CBS' Hawaii Five-0  had 5.8 million viewers.

In the weekly ratings that came out Tuesday, March Madness helped CBS get back on top after three weeks of Fox victories. Two close games — Connecticut-Arizona and Kentucky-Ohio State — wound up in Nielsen's top 15.