Bernie Sanders is always an underdog because he is fighting against large special interests who don’t want to see his agenda succeed.—Rep. Ro Khanna on Sen. Bernie Sanders' announcement that he's again running for president.

Early reaction among Lee’s progressive base for endorsing the centrist Democrat is not positive.

I'm running for president. Let's do this together.— U.S. Sen. Kamala Harris, a former Alameda County prosecutor, announcing her run for president in a tweet early Monday morning.