By number of delegates awarded, Bernie Sanders was in first place at the end of February, just before the multi-state "Super Tuesday" primaries, with 63 pledged, ahead of Joe Biden at 54 delegates and Pete Buttigieg at 26.
Sanders lost any claim to "frontrunner" status on Super Tuesday (March 3) when, despite winning California, Sanders lost the overall delegate tally to Biden, 558 to 648. Sanders suspended his campaign for president on April 8, a day after losing Wyoming to Biden.
Over the course of the primaries, Sanders won contests in New Hampshire, Nevada, Vermont, Utah, Colorado, California, North Dakota, the Northern Mariana Islands and the Democrats Abroad caucus.