Dear Bernie, That Gravis poll seems to be an outlier. Love, Hillary

And they don't give us much to go on.  

Source:  Real Clear Politics

Gravis Marketing gets a 'C' from the FiveThirtyEight's pollster ratings.

Other state polls:
The Fast and the Furious 14: New York polls keep comin' right at ya! (4/18/2016)
Latest California primary polls give front runners a bump.  (4/17/2016)
Sanders still unable to cut Clinton's lead to single digits in New York.  (4/17/2016)
The Fast and the Furious 12.  (4/17/2016)
Clinton pads her lead in latest New York primary poll.  (4/16/2016)
The Fast and the Furious 10.  (4/15/2016)
Donald Trump's Joe Paterno meltdown moment in Pittsburgh.  (4/14/2016) 
The Fast and the Furious 9.  (4/13/2016)
The Fast and the Furious 8.  (4/12/2016)
Kasich, Cruz continue to duke it out for 2nd, Clinton maintains double-digit lead in NY.  (4/11/2016)
Trump, Clinton lead in New York Presidential primary polls.  (4/10/2016)
Presidential primary focus moves East: A look at latest polls from NY and PA.  (4/7/2016)
Trump continues to hold onto a slim lead in GOP California primary polls.  (4/5/2016)
Trump all but untouchable in New York GOP Presidential primary polls.  (3/31/2016)
Latest GOP Pennsylvania primary poll shows tight race between Trump and Kasich.  (3/24/2016)
Everybody gets a boost in latest Arizona presidential primary poll.  (3/22/2016)