Looks to me like the DNC vs. RNC numbers are about flat convention to convention with the BIG exception being FOX News. Looks like 2 million more people tuned into FOX to watch the RNC. So, if we factor in the Big 3, CNN, MSNBC and FOX, there are about 2 million or more people watching this "show" that the DNC.
From the Washinton Post -
http://www.washingtonpost.com/wp-dyn/articles/A54789-2004Sep1.html ABC's and CBS's numbers were on par with their first night's coverage of the Democrats' clambake in July (the Big Three networks covered Monday, Wednesday and Thursday nights during that convention), while NBC's average was about 1 million viewers ahead of its first night at the Democratic convention. MSNBC's Tuesday prime-time average is only very slightly ahead of its Tuesday Democratic convention score, and CNN fumbled about 1 million viewers that night, convention-to-convention. That might account for some but not all of FNC's increase.
Meanwhile, FNC's numbers at the Republican convention have skyrocketed. During the Democratic convention, its biggest audience was the 3 million who gathered on Tuesday, July 27, at 8 p.m. when Bill O'Reilly went mano a mano with documentarian Michael Moore. In the 10 p.m. hour, the biggest draw FNC was able to secure during the Democrats' Boston party was 2.6 million for Sen. John Kerry's acceptance speech.