'Tyranny of the Minority' writers say Constitution not strong enough.

America’s democracy is in an uncharted and fragile place, according to two Harvard government professors. In their new book, “Tyranny of the Minority,” Steven Levitsky and Daniel Ziblatt say politicians are welcoming anti-democratic extremists into their party ranks and part of the problem lies in the Constitution. Laura Barrón-López spoke with the writ…