Going into the Democratic National Convention, Gallup has McCain and Obama tied up at 45% a piece. Rasmussen Reports puts Obama in the lead with 46% to McCain's 42%. Despite the candidates being neck-and-neck, various web metrics still diverge greatly, consistently favoring Obama. While JohnMcCain.com has seen a major traffic increase since earning the nomination, BarackObama.com is still averaging over a million more hits per month [Compete]. That's over double the traffic.
If you look at search engine traffic, over 3000 keywords are driving visitors to barackobama.com while just under 1000 keywords drive visits to johnmccain.com
On Youtube, Obama is remains light years ahead of McCain for subscribers and views. It's just impossible for McCain to make any headway so the raw Youtube numbers are pretty worthless. There's one interesting consistency. Obama's Youtube videos are generally rated 5 stars. McCain's are generally rated 3 stars. See the graphic above.