If it's not such a good idea then perhaps it was only done as a publicity stunt, and that would explain why it hasn't come up again.
I don't know that I care much one way or the other. But saying "Democrats haven't voted it down" is actually different than "Democrats have made it a priority"
But the Dems do get campaign contributions from Oil & Gas companies. Only at 20% of the rate of folks in the GOP but it's not as though it's a 99/1 split.