MIAMI — Democrat Hillary Clinton and Republican Donald Trump seized decisive Super Tuesday victories with math and momentum on their side, leaving rivals scrambling for last-chance, long-shot strategies. For the Republican establishment, the search was increasingly dire.

Trump's seven victories in states across the country amounted to a GOP establishment collapse with no clear sign of rapid recovery. While his rivals promised to fight on, the party remained deeply divided over the preferred Trump alternative. Marco Rubio won only liberal Minnesota. Sen. Ted Cruz took his home state of Texas, neighboring Oklahoma and Alaska.