The chart above is from the Morning Consult Poll. It shows the support for the leading Democratic candidates on the national level before and after the New Hampshire primary.
The first survey was done between February 4th and 9th of 1,989 voters, and has a 2 point margin of error.
The second was done on February 12th of 948 voters, with a 3 point margin of error.
Although the second poll (taken after the New Hampshire primary) is not as large as the first, it shows Sanders has increased his support by 4 points while Biden's support dropped by 3 points.
Still though, Sanders is far from having majority support among Democratic voters -- with 29% supporting him and 71% supporting others.
