I don't disagree that it is all very petty. What the hell is "momentum" anyway? All anyone talked about during the primaries was this nebulous "momentum" which is really just another way of saying that people only want to vote for the guy who is going to win, rather than voting for the person they believe in. And we have no one to blame but ourselves, because we love it. The best thing that you can do is to turn off the cable news channel and skip the newspaper articles that have attention grabbing headlines. Just like with advertising, if you stop paying attention, it'll go away.
The real problem is 24 hour cable news. There simply isn't that much important news going on to fill the time permitted. Thus they create stories to have something to talk about. Couple that with a 24 hour life in the video spotlight, and you have a recipe for muckraking journalism. Abraham Lincoln was a tall gangly dude with a high pitched, irritating voice. But it didn't matter because most people had never seen anything other than a photograph of him. Thomas Jefferson was an introvert, who much preferred writing at his desk to appearing in public. He gave his inaugural address in such a soft voice that most people didn't even hear it. James Buchanan was single when he was elected, had a 20 year "roommate" with a guy, and his niece fulfilled the role of first lady. William Howard Taft weighed almost 350 pounds! People like that wouldn't be elected in today's media spotlight. Think of the field day the news would have. The media was guilty of muckraking in those days too, but the effect was not as pervasive as it is today.