Excellent idea. In fact, the mantra of the incoming Congress should be a top to bottom review of how to "Defund the Left."
Democrats are already at a disadvantage because of the soft money ban, and they have more Senate seats to defend in the next two elections. Republicans can cement their majority by turning off the cash nozzle of taxpayer funds that wind up among the long and sundry "public policy groups" that are nothing more than fronts for leftist advocacy.