We can talk all we want about people liking Obama's platform. What this really means is people liked the oversimplification of Obama's platform.
"Not Bush!"
"More abortion!"
"Less taxes!"
"No more recession!"
"Icky wars go bye-bye!"
"Free doctors and hospitals!"
"Plus he's black and you're a little bit racist if you don't like him!"
It's a cold, sad fact that many many people don't pay attention to actual policy ideas and go with the happy-clappy version of things. Sure he might have said he'll bring all of them, but he conveniently leaves out HOW. (I know he has said how on his website, but people don't look at those "wordy" parts of the site, and some of them have been criticized as being bad for the country and not able to work.)
I also know every campaign is like this, but Obama's has been worse, in that it really attracts the people who don't bother to research even a little.