Sen. Ted Cruz's two big wins on Saturday bolstered his case that he is the strongest candidate to stop Donald Trump's march toward the Republican nomination, as Sen. Marco Rubio's support faded. Cruz crushed Trump in Kansas, upset the businessman in Maine, and provided Trump with a tougher than expected challenges in Kentucky and Louisiana. The results come as an anti-Trump movement began to galvanize conservative activists as well as party elites. Trump came under fire in a Thursday debate, was the subject of blistering attack speech from 2012 Republican nominee Mitt Romney, has been at the receiving end of...