Mistakes the OP made:
1.) Believing polls taken a year before an election have any predictive value.
2.) Believing a SUSA poll. After their absolutely and consistently horrible results in Kentucky, I take all of their polling with a grain of salt.
Also, the OP is seriously late to the party on this one. The poll came out almost 2 months ago.
They are the only thing to go on they might not mean anything in the election. But they are the only source to assume what the results will be
Now that is some tip-top logic my friend. The response to not having any credible source of information with which you can predict election results which are almost a year away isn't to just shrug and use it anyway cause it's all you've got. Polls this far out from an election are totally meaningless, just ask [insert candidate who was leading decisively at some point prior to the commencement of the campaign].