Democrats running for president seem confounded as to why they’re not getting any airtime as all 98 of them compete for the party’s nomination. But they may have figured out the secret this week. They’re going to have to differentiate themselves and that means, yes, fighting each other. Viciously, if need be.

They might have gotten a clue this week when Sen. Cory Booker, D-N.J., resurfaced on cable news after weeks in obscurity. We were only reminded of who he is because he pointedly attacked Joe Biden for heralding his working relationship with segregationist senators as an example of “civility.”