The chart above compares national support for Biden and Sanders for before and after the last primaries. The chart is from the Morning Consult Poll. The before sample was done between March 5th and 8th of 9,593 likely Democratic primary voters, with a margin of error of 1 point. The after sample was done on March 11th of 2,072 likely Democratic primary voters, with a 2 point margin of error.
Before the March 10th primaries, Biden had a 14 point lead over Sanders. Now that lead has ballooned to 24 points.
