Well, no, they probably can't. Under Citizens United and FEC v McCutcheon, the idea of banning lobbying (at least via SuperPac) is a non-starter with the court

Well, no, they probably can't. Under Citizens United and FEC v McCutcheon, the idea of banning lobbying (at least via SuperPac) is a non-starter with the courts. That may have changed with Scalia's passage, but under current precedent, you can't ban it, whether or not you replace it with something else for the party insiders.