Early Tuesday evening, as National Guard troops faced off against protesters and rioters on the streets of Los Angeles, powerful teachers’ union president Randi Weingarten hosted a virtual town hall with Democratic Kentucky Gov. Andy Beshear.and two leading political operatives in Democratic Party politics, Leah Greenberg, founder of a political nonprofit, Indivisible, and Rev. Al Sharpton, founder of another political nonprofit, National Action Network. Greenberg hailed an upcoming wave of protests this Saturday — set to sweep through even "really red areas of the country," marked with mostly Republican voters — as a stand against President Donald Trump. But what...