After a bit of a build-up, former Illinois Rep. Joe Walsh has made it official and announced he’s running for president . He will challenge Donald Trump for the Republican nomination in 2020. “I’m going to run for president,” Walsh said on ABC’s This Week. “I’m running because he’s unfit; somebody needs to step up and there needs to be an alternative. The country is sick of this guy’s tantrum—he’s a child.” The announcement wasn’t exactly surprising considering the controversial radio host known for his incendiary remarks has been saying for days that Trump needed a challenger from the right....