Not that I'm an Obama fan (voted for "McSame" actually) but 100 days is hardly enough time for any President's policies to have significant effect, good or bad. He's done a lot in his first 100 days, but those actions haven't had time to develop consequences yet. Just wait though - you don't inject hundreds of billions of dollars into irresponsible corporations and not have some sort of effect.
The 10% that have changed their minds probably did so because they've run out of patience for "change we can believe in" to actually arrive. I'd bet some of them are the the same folks who created this mess by being too impatient to save money before buying.