As new cases of the coronavirus soar in much of the nation, a new national poll now shows Democratic challenger Joe Biden leading President Trump by 15 percentage points. The Quinnipiac University poll – which was conducted July 9-13 – shows the former vice president and presumptive Democratic nominee with 52 percent support among registered voters, with Trump at 37 percent support. BIDEN LEADS IN NEW SWING STATE POLL BUT MAJORITY SAY 'SECRET TRUMP VOTERS' COULD TILT ELECTION Biden’s lead is almost double the 8-point advantage he held in Quinnipiac’s previous survey, which was conducted in mid-June. And it tops...