The story gets to a Democratic representative in paragraph 7. He said it's "encouraging" that the GOP is considering this cut, as if the Democrats are sane, normal people, and the GOP is a recovering ethanol addict who must be brought along. But Democrats voted 46-6 against the measure. That's the big story: Democrats are so committed to protecting the special interest of ethanol farmers that they are unwilling to raise revenues!
The Washington Post finally interviewed a Democratic Senator who voted against removing the subsidy... never. In fact, the article never explains why Democrats opposed the bill. It might have had other provisions that they disagreed with, but we're not informed. The only Democrats interviewed (mainly VP Joe Biden) seem generally in favor of ending subsidies... but again, it's not really clear.
LA Times and SF Gate articles seem to clear up why the Dems opposed this slam-dunk revenue raiser:
In the end, [co-sponsor Sen Diane] Feinstein [D-CA] voted against her own amendment as did Sen. Barbara Boxer, D-Calif. Democrats largely voted against the measure after leaders encouraged a "no" vote on procedural grounds. (SF)So there you have it.
Democrats were upset because Coburn forced a vote without the blessing of majority leader Harry Reid, D-Nev., who jealously guards the majority's control of the chamber. (LA)