The chart above reflects the results of the latest NPR / PBS NewsHour / Marist Poll -- done between December 9th and 11th of a national sample of 704 Democrats / Leaners, with a 3.7 point margin of error.
The chart above reflects the results of the latest IBD / TIPP Poll (from Investor's Business Daily) -- done between December 5th and 14th of a national sample of 312 Democrats / Leaners. No margin of error was given for just this group, but it would be pretty large because the group is so small.