They did get four Justices to agree with them in Heller.
Nope. Four Justices decided as they were pre-inclined to do. The Brady Campaign took credit for that. There's no causality, however.
If there was, they could have killed carry in national parks and Amtrak. They'd have saved the ban on guns in public housing. They've got the administration they want, and they still can't get anything done.
I wonder if keeping them around might be a good idea. A group that knows the right things to say to the right people in the middle
would be far more dangerous.