Riding on a string of big victories in the presidential primaries, Donald Trump has not only extended his lead against his GOP rivals, but also he has gained ground against Hillary Clinton, according to the latest IBD/TIPP Poll. ------------------------------------------------ The poll finds that Trump now leads Ted Cruz by 19 points — 48% to 29% — which is more than double his lead last month. At the same time, Hillary’s lead over Trump is now just seven points (47% to 40%), down from 12 points last month. What’s more, 65% of Republicans and Republican-leaning independents now pick Trump as either...