Bernie Sanders' presidential campaign has raised more than $36 million in February and is pushing his supporters to help him top $40 million for the month by the end of the day.
Sanders faced an end-of-the-month deadline in his primary campaign against Hillary Clinton. Entering the month, he had raised nearly $95 million since launching his campaign last April.
Sanders has raised most of his campaign money online in small increments and has made overhauling the campaign finance system a central part of the race.
He is campaigning Monday in Minnesota and Massachusetts heading into the Super Tuesday contests.