Polls are such funny things. I don't know that any single poll in this country is truly accurate but this one has Votes in the hundreds of thousands each week, while the Gallop poll uses only a sampling of 1000 a day.
Who knows but it is worth noting if nothing else.
Straw Poll: Dec. 21 - Jan. 4 - Political Machine
While that link shows dates Dec through Jan it links to the current March 31st - April 7th poll.
Right now the poll shows Clinton ahead in all states, but it changes drastically as it updates in real time.