If you live in an open primary state, vote Bernie in the primary.
There are many old school Democrats that will stay home if he’s at the top of the ticket.
Bernie is our best shot at winning the House back.
Sanders will not appeal to the middle class or better soccer moms who are trending liberal and have helped to flip suburban counties toward the Democrats. However, he would have more appeal to blue collar voters, as he isn't an obnoxious billionaire who despises workers and farmers, an over the hill swamp critter, an inexperienced small city mayor, or the Massachusetts answer to Hillary. Sanders comes from a humble background and, like him or not, he is the best orator of the lot. He has passion almost at a Trump level.
Sanders could flip MI, PA, and WI back to the Democrats, especially with a black VP choice. However, he won't play well in places like VA, CO, NC, and NV, where moderates play a big role.