Let's face it - money always wins.
There is big money on both sides of this issue. Sure, big ISPs like Comcast, and TWC, want to kill NN. But big content companies like Netflix and Amazon are on the other side. Google used to be a solid supporter of NN, but now that they are getting into the ISP business, they have flip-flopped on the issue.
Generally, content companies donate to Democrats, and ISPs donate to Republicans. So Democrats oppose IP reform, and Republicans oppose NN. Pick your poison.