What makes it a plutocracy is that while everyone can theoretically lobby, the only ones who practically can lobby are the ones with the most money.

This is completely false, however. Practically speaking, anyone can petition their elected official. You need not be a large corporation to get an audience, and if they'll only speak to a lobbying firm, you can group together and hire one or open one oyurself.

Allowing everyone to lobby only works on paper, but in reality it grossly favors large corporate lobbies. The only way to ensure fairness is to eliminate all lobbying to politicians. It is far more fair to let all special interests lobby the voters, not the politicians.

You're not going to get far with another Constitutional amendment that restricts the rights of the people. It's not going to be a starter for many.