A more apt comparison would be between Obama's (or some other politician) personal life and that of an actress. Now, some would argue that we still have no business in thinking about our leaders' personal lives, but I'll neglect this point. Also, I can hardly speculate whether the average politician is better than the average actor... either way, slim pickins.
At least political figures do have more of a direct effect on society, as will space exploration at some point if it continues to progress. The same is not true for actors outside of the movies - I just want good movies, and maybe the occasional biography or wikipedia entry about the actor will suffice. To sensationalize everything they do is a bit ridiculous. On the other hand, a leader who we can confirm as being hypocritical (which is usually the case) should be much more relevant to our interests ...