It not as if Obama won by a large margin. You guessed right after guessing wrong the last 2 elections.
I think that you are completely wrong with this statement for a variety of reasons.
First, Obama DID win by a large margin, in both terms of popular vote AND electoral vote.
Popular vote totals:
Obama - 69,456,897
McCain - 59,934,786
Percentage - 52.9% 45.7%
The margin of Obama's pop vote victory dwarfs anything Bush ever achieved. And it's the largest victory since 1996.
Obama - 365
McCain - 173
Once again, the largest margin of victory since 1996. And a clear landslide win in terms of electoral votes.
As for the last two elections, you are incorrect, one of two ways depending on how you look at it. If you are referring to presidential elections, I was wrong on the last one - 2004 - but right on the preceding one, 2000; I voted for Bush and guessed he would win over a boring Al Gore.
If you are referring to national elections in general, I was wrong in 2004 but correct in 2006, when I predicted the crushing of the GOP and that was exactly what occurred.
It's not like it was rocket science figuring either one out. Yet you bunch, both times, seem to have been totally gobsmacked by it. I suppose it's the fact that the GOP has suffered it's worst losses in over 60 years that has ya'll depressed, especially given the 'permanent Republican majority' bullshit that your leaders were spouting in 2004. Gotta be depressing. And 201o looks like another nightmare for you in the Senate, as a ton of Republicans are up for re-election and the Dems have very few seats to defend that term.