Like this post above me, I get it, post tweets to fuel the thread, but that's not gaining voters. The average voter doesn't care about the sound-bites that Trumps makes and do.
To be honest, he does that to keep folks talking about him more so...Dude knows the game and knows how to keep himself as a person folks sought out. Being funny. Not serious. Only older folks will look at that as him being off/stupid/retarded. Most folks see it as trolling or putting on.
He's in show business. He knows what to say in front of cameras
Trump can say, he eats pigs and horses for dinner and folks will run with it...lol. That's not going to earn the Dems voters