I did see an article on the inauguration breaking records of internet traffic and straining servers and whatnot. I can't remember where now. But if you combine TV and internet viewership, I'd imagine it would be a safe bet that more eyes were on Obama.
I would hope that it broke internet records. No one was on the internet in 1992, and what a 1/10 of what we have now were on in 2000?
Not counting reelections because fewer people care about those. I doubt Obama's party will be as big in 2012 as 08 if he wins.