In order to get any BODY to do any THING, you have to give them a personal stake in it. Sometimes that stake can just be the benefit of having a cause to adopt, regardless of whether or not you know anything about it or even care (for more examples of this, see Al Gore). Just like all falling celebrities shoot their mouths off on either side of the political aisle in a desperate attempt to get a headline somewhere, any Senator who wants the rockstar status of Al Gore and Chuck Schumer has to adopt a cause. What better cause than one that is cutting you out of their profits, is widely seen as a vice, and is already regulated with a heavy hand? Unfortunately for them, I think this cause is over-saturated.