NBC collected a rare ratings win Monday night with two hours of its news magazine Dateline and an episode of Medium , a show that CBS picked up when NBC decided to cancel it last month. Dateline led between 8 00 p.m. and 10 00 p.m. except in the 9 00 p.m. half-hour, when a rerun of the CBS hit Two and a Half Men took over the lead. At 10 00 p.m., Medium was edged out by a rerun of CBS's CSI Miami. Overall results for the night were tight, with NBC averaging 7.34 million viewers and CBS, 7.23 million. ABC was a distant third with 5.66 million viewers, followed by Fox with 5.07 million.