The State of Texas, home of ten gallon hats, creationism, and iconoclasts, has done something really interesting. It passed a law preventing educational testing lobbying groups from making political contributions to state politicians. If this law holds up, it is the first step on a very good path. The only thing they left out is . . . all of the other lobbying groups.
The constitution guarantees the right of citizens, individually or in groups, to petition their representatives. It does not give them the right to bribe them.