Pledged delegates to date: Clinton, 609; Sanders, 412 (Difference: 197)
Per 538, Clinton is at 115% of where she needs to be to win the nomination and Sanders is at 85% of where he needs to be.
The link below takes you to 538, which breaks down the number of delegates each candidate needs per state to be on track to win and where the race is now:
Who's on Track for the Nomination?
RECENT POLL RESULTS
Disclaimer: I have not evaluated all these polls for quality.
Louisiana (Primary March 5), 51 delegates
Clinton, +47 (61/14) March 1 Hayride/Magellan Poll 865 Dem LV
Michigan (Primary March 8), 130 delegates
Clinton, +28 (61/33) March 1 Mitchell Research & Communications 427 Dem LV
Clinton, +20 (56/36) Feb 22-27 Marketing Resource Group 218 LV (not a good poll)
Mississippi (Primary March 8), 51 delegates
Clinton, +54 (65/11) Feb 29 Magellan Strategies, 471 LV
Florida (Primary March 15), 214 delegates
Clinton, +30 (54/24) Feb 22-27 University of North Florida 685 LV
Clinton, +26 (59/33) Feb 21-24 Quinnipiac University 476 LV
Clinton, +25 (57/32) Feb 24-25 Public Policy Polling 388 LV
Illinois (Primary March 15), 156 delegates
Clinton, +29 (57/28) Feb 24 We Ask America 1116 LV
North Carolina (107 delegates) and Ohio (143 delegates) primaries:
There is no recent polling for these states, although the latest February polling showed Clinton with double-digit leads in both states.
Kansas caucus (33 delegates)
A poll showed Clinton leading Sanders, but with 44% of poll respondents undecided, the results are meaningless.
Nebraska (25 delegates) and Maine (25 delegates) caucuses:
Although no polling is available for Nebraska and Maine, which caucus on March 5 and March 6, respectively, Sanders is expected to win both comfortably because of their high majority white populations and because he tends to fare better in caucuses. However, even in the unlikely event that he scored all 50 delegates plus most of the 33 Kansas delegates, Hillary is likely to widen her lead after March 15, with blowout wins in Louisiana, Mississippi, and Florida and strong wins in Michigan and Illinois. She also has a demographic advantage in Ohio and North Carolina, whose populations are more diverse than populations in states Sanders has shown he can win.