Obama disappoints me...

[a completely inoffensive name]

Agreed so far, except that there are quite a few people over 25 who are taken in by it.
Maybe, those just might be hardcore Democrats.

Not literally, of course, but he was certainly effective in creating - or at least encouraging - the image he received as the Obamamessiah. The right mocks because some of the left created this image, and we find it amusing.
This image though, if you look at it deeper, was not created and endorsed by Obama and his group. Essentially, what you had was a massive resentment toward the Republicans for quite a while (since late 2003, after the Iraq invasion), but none of the candidates the Democrats had were strong or charismatic enough to win. Now suddenly, in the 2008 Democratic primaries, you had two strong candidates, Hillary and Obama and the tough battle between the two of them created the situation where both looked ready to pounce on the weakened Republicans with renewed momentum after the primary. So after the primary what you had was not an image of a Messiah, you just had a complete reversal of what had been hapening for the past 8 years. Now the Republicans were the weak ones, and the Democrats were the strong ones. This caused the public to flock away from the Republicans in large numbers. Not realizing what was going on, the right has been attempting to write this off as Obama trying to seem as a messiah when in actually, it was a mass rejection of Republican ideals not smoke and shadow from the Democrats. All Obama had to do (and did) was say I am completely different from George Bush and McCain is exactly like him, and boom he wins the election. No tricks, no messiah, just a simple change in momentum combined with public resentment, along with a few catchphrases that tempted many apathetic young voters to come out.