Promoted by dems and supported by left-wingers is scary. Opposed by Republicans isn't since they've been duped by another entity you've mentioned, the ISPs, who do not want the government to interfere with them milking more profit out of the last-mile by imposing toll-booths to companies that provide content. You failed to mention who else supports it, pretty much every content-providing company out there.
Now that refers to net neutrality, NOT fairness doctrine or anything else the Democrats want to pass under the guise of net neutrality.
Also, just about every single free-market economist opposes it. Just about every freedom advocacy group out there opposes it. If you think the government should be able to force every domestic shipping company to charge the same flat rate for every package - regardless of weight or size - that the post office charges for a letter, then you would love the Markey Net Neutrality bill.