My personal experience is their views start as their own. They then add enough local perspective to get elected to early feeder positions (city council, state house). Then they add the official party positions to help build influence within the structure. Some then add “national aspiration” positions. With these “positions” they can typically get plenty of $$ (both left and right). It is exceedingly rare to see a legislator vote in a way that cannot be explained by one of the above. There is no need to pander for $$ because the other side will always match the $$.
Our govt is broken, but not because votes can be bought for $150.
But if that is true, then we can do a go fund page and completely redesign Iowa G&F laws to our liking. 51 Reps + 26 Senators and we have carte blanche for $11,500. Hell it took 6x that to get a not guilty verdict in one WY trespass case.