Not very clear who exactly was polled. Registered Republicans? All voters? Good news but I never heard of Gravis Marketing, and I'm a little skeptical.
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Here's a link to the poll with results shown. It doesn't say how they did this if it
was by party or otherwise but they did asked party affiliation.
They did asked which candidate in the GOP/DEM primary would you vote for. They gave a choice
They then went to Hillary versus each GOP candidate one on one. Clinton only won one of those,
it being against Jindal. Clinton tied Christie, Fiorina, Paul, Rubio. Clinton lost to all
the other GOP Candidates.
Click the link and scroll down for the results, worth a click IMO.