I'm not sure charming is the word. Hussein is an exceedingly good speaker, comes across as decent and genuine and most Americans WANT to like him. Almost half the country is still emotionally wedded to him, and it is very difficult for them to move past it.
Unfortunately, in politics, being right just isn't even close to being enough. Obama is wrong about pretty much everything, but people tend to like him and want to give him the benefit of the doubt. Obama knows that, and as long as he distracts, deflects and otherwise blames others for his failures he has a good chance to win again in 2012.
I’m not trying to be argumentative, but in what way is Obama a good speaker? He has a monotonous singsong delivery, undercut by constant head-swiveling as he reads his teleprompters. When has he ever spoken a really great or memorable line? Fewer and fewer people even listen to him; many, when they do, acknowledge they’ve heard the speech before. He says nothing new or inspiring; he’s a very limited speaker with one mode: campaign.
Reagan could shift gears and talk about anything in a powerful yet engaging way. Obama just looks like what he is: a teleprompter reader.