The poll predictions might be uncomfortable for some, & the source might elicit a Pavlovian objection, but it looks cromulent enuf.
(Note that both a Dem & a Pub pollster were involved, which would tend to limit mischief.)
As with all polls, they have limited value in predicting the outcome.
From the link in the OP......
trails Sanders by three points nationally
By
Dana Blanton
Published February 18, 2016
FoxNews.com
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Bernie Sanders now tops Hillary Clinton in the race for the Democratic nomination.
The latest Fox News national poll finds 47 percent of Democratic primary voters now back the Vermont senator, up from 37 percent in January. Clinton gets 44 percent, down from 49 percent a month ago.
CLICK TO READ THE POLL RESULTS
This is the first time Sanders has been ahead of Clinton, who not long ago was regularly described as the “presumptive Democratic nominee.”
Clinton led Sanders in the Fox poll by as many as 46 points last summer, and had a 22-point lead as recently as two months ago.
Fox News National Poll of Democratic Voters | InsideGov
“One thing that is clear from our poll -- and others -- is that Clinton has been losing support and Sanders has been gaining,” says Democratic pollster Chris Anderson. “And this process appears to have accelerated since the contests in Iowa and New Hampshire.”
The timing of Sanders’ surge doesn’t surprise Republican pollster Daron Shaw: “Historically, lesser-known candidates beating establishment candidates in early contests have seen the biggest boost in their national support.” Shaw and Anderson jointly conduct the Fox News Poll.