JOEY BATTENFELD: What to watch for on Super Tuesday.

The big question heading into Tuesday’s contests in 14 states is whether Biden, fresh off his impressive win in South Carolina and now with Amy Klobuchar and Pete Buttigieg endorsements, can win over enough last-minute voters to block Bernie from a Super Tuesday rout.

The Vermont socialist should win the biggest prize — California — and that could give him hundreds of delegates to make him the clear front-runner heading into the next round of contests next week.

But the Democratic establishment is quickly coming together behind Biden in a last-ditch bid to keep Sanders from winning other competitive states from Texas to Massachusetts.

How desperate are they? They’ve wheeled out John Warner to endorse Biden in Virginia. A guy who makes Biden look young and sprightly; how many Virginia voters even remember who he is? Not many, the Dems probably hope. . .