Will SCOTUS decision re campaign funding weaken lobby?

My off the cuff reaction is that this Supreme Court ruling on corporate campaign giving is bad for the lobby. It might bring much money into the system from sources that have nothing to do with Israel. And it may even encourage the oil companies to exercise their “free speech” in ways that AIPAC doesn’t like. Surely this is not a “progressive” opinion. I’d be curious if someone who knew more about it confirmed my reaction.