Except that Snopes posts their sources... which "Beforeitsnews.com" does not - or they do, but if you follow it, you get a 404 error from a blogsite. The ole "I question your source" argument is tired and honestly takes credibility away from valid points (this isn't necessarily directed at you N2sooners, I've just seen far too many arguments end in that and it's about as effective (though less entertaining) as turning to "Yo mama" in a serious political debate.
We live in the age where you can do nearly as much research as most journalists by simply doing a quick search on the net - "I question your source" shouldn't even be a response anymore. We can post sources to discredit with little more effort.
I always question Snopes. They aren't the experts they make themselves out to be and they have an agenda. But I also questioned my own source and I believe Snopes is right in this case. And I still think they went over the top saying it wasn't even plausible when the administration did send warnings to the Kansas governor publicly.