ANN ARBOR, Mich. — Michigan junior quarterback J.J. McCarthy, who led the Wolverines to a national championship last Monday, two wins against Ohio State and two Big Ten championships while compiling a 27-1 record as starter, has declared for the NFL Draft. McCarthy announced his decision Sunday afternoon on social media, one day before the deadline for underclassmen to enter the draft. The NFL Draft is April 25-27 in Detroit. “This decision was not easy and how could it be — I love my teammates, I love my coaches and I love it here in Ann Arbor,” McCarthy wrote, saying he had spoken to many, i…