“My advice to the students? When you finish marching on the mall, march into the specific congressional districts where you can actually make a difference. The midterm elections are in eight months. A vast majority of congressional districts have been gerrymandered bright blue or ruby red. In those deep-red districts, the only threat that far-right members of Congress face is a primary challenge from someone farther to the right. You may regard voting for universal background checks as a no-brainer, but they see it as a blemish on their N.R.A. rating — an open door to a primary challenge. That explains the unmovable fealty these representatives have to the gun lobby. But in this election there are more than 40 truly competitive districts, including many where you can make a real difference by helping replace an incumbent who consistently supports the gun lobby with a challenger who won’t. […] You can stage marches and school walkouts, but then walk into the swing congressional districts that matter. In the end it’s not about standing up to be heard. It’s about changing who sits in Congress”