Here's a site to keep in your bookmarks/favorites to look at after each state's primary/caucus because it keeps track of who is currently leading in delegates.
For Democrats, a Democratic candidate needs 1,991 total delegates to win party nomination, as of February 23rd, the AP reports that Bernie Sanders is leading in delegates with 31 delegates, he needs a total of 1,960 delegates currently to win:
For Democrats, a Democratic candidate needs 1,991 total delegates to win party nomination, as of February 23rd, the AP reports that Bernie Sanders is leading in delegates with 31 delegates, he needs a total of 1,960 delegates currently to win:
Delegate Tracker
interactives.ap.org