Four contests are in the books; Hillary Clinton leads the delegate count 91-65 in those; she has a much larger lead of 544-85 when superdelegates are included. 2,382 delegates are needed to secure the nomination.
Super Tuesday is less than two days out; over 20% of Democratic delegates will be up for grabs that day. Here's a very quick update on the polling in each state. Democratic primaries generally follow the same proportional allocation formula, allocating some statewide, some by Congressional District, with a 15% minimum threshold. As a result, except perhaps for Vermont, both Clinton and Sanders will likely earn some delegates in each contest.
In the list below, the delegate numbers are totals for the Democratic Convention, they may not all get allocated on Super Tuesday. Select a state for details. For a one-page look at who is leading each of the Democratic contests, not just those on Super Tuesday, go here.
Alabama (Primary, 60 delegates): Clinton leads Bernie Sanders by 28 points in the PPP poll out mid-month (Solid Clinton)
Arkansas (Primary, 37): Clinton up 25 in a PPP poll (Solid Clinton)
Colorado (Caucus, 79): No recent polling; delegates won't actually be awarded until a later date
Georgia (Primary, 116): Clinton polling mid-60s in recent polls (Solid Clinton)
Massachusetts (Primary, 116): Neighbor state to Sanders home; if polling is correct this will likely be the closest Democratic battle on Super Tuesday (Toss-up)
Minnesota (Caucus, 93): A late January poll showed Clinton up by 34 points (Solid Clinton)
Oklahoma (Primary, 42): The most recent poll had Clinton up just two, while others give her a much larger lead (Leans Clinton)
Tennessee (Primary, 76): Clinton up by 26 in two recent polls (Solid Clinton)
Texas (Primary, 252): The most recent polls have Clinton up by 20-30 points (Likely Clinton)
Vermont (Primary, 26): No contest here; Sanders leads his home state by about 70 points; may keep Clinton under 15% and win all the state's delegates (Solid Sanders)
Virginia (Primary, 110): The polls are a bit varied, but Clinton leads by at least 12 points; average is almost 20 points (Likely Clinton)
March 1 will also see the American Samoa territorial caucus, with 10 total delegates.