He's not wrong. He's probably saying it for the wrong reasons, but the statement itself is not untrue.

Democrats can't actually solve any of the issues they campaign on since the more things they actually solve, the fewer issues they have to make their right-wing, milque toast corporate candidates appear distinct from the GOP.

Doing things like legislating abortion, reforming healthcare, protecting minority rights, fixing our broken immigration system etc. would mean they then have to start looking into the real fundemental issues like campaign finance reform and repealing Citizens United and stuff.