Bent on stopping Donald Trump from winning the Republican presidential nomination, Mitt Romney plans to hit the campaign trail Monday in Ohio with Gov. John Kasich, who is looking for his first win of the presidential campaign Tuesday in his home-state primary. -snip- Mr. Romney plans to appear with Mr. Kasich at a pair of events on the eve of the primary in Ohio, where Mr. Trump is looking to expand his lead by winning the winner-take-all contest. Mr. Trump says he wishes Mr. Romney showed this sort of energy during his 2012 presidential campaign, but says instead Mr. Romney...