Donald Trump tightened his grip on the Republican presidential nomination by dominating Super Tuesday. But his prospects of defeating Hillary Clinton in the general election are fraught with new trouble.

By winning 7 states yesterday, he denied Ted Cruz a string of victories in Southern states that were to be his launching pad to the nomination. Instead, Cruz won only his home state of Texas and neighboring Oklahoma. Trump captured Georgia, Alabama, Tennessee, Arkansas, and Virginia – the mythical Cruz base.