SUSA polls the democratic primary, McMahon leads

Swing State Project brings us the news;

SurveyUSA (8/18-19, registered Dem voters):

Mike McMahon (D): 64
Steve Harrison (D): 18
Undecided: 18
(MoE: ±4.3%)

As noted this is a poll of registered voters, not likely voters who will turn out for a September primary where very little else is on the ballot.