Why does Trump focus personally on Obama instead of his agreement on Obama's Healthcare law, EPA, Kelo case...?

I am no Trump fan and I know he will not be a serious candidate for anything. But he has made arguments and points about the economy. The media focused on the birth certificate issue because that is how the demonize people to convince people to not vote for them. Trump is no more a serious candidate for President than is Palin. She is another good exmaple of how the media tries to filter what she says to keep her from being heard. She defeated that big time by going on the road and using the internet to get her message out. But she has settled into a role as social commentator, writer and speaker. She is making a fortune (just like Gore did) from doing that and knows that she has no popular support for a candidacy, but she has huge support for her views. She is smart and so is Trump, we are just dumb because we let biased media form our views for us.