Sarah, thank you for your prompt reply. What I was thinking about in the second possibility was that sometimes it is important to a point of view that the public frame an issue in a certain way.
Some legislation affects everyone in the state.
Other legislation affects a small number of people but does affect some ortganization that hires a lobbyist. If few or no people in a legislative district are affected one way or another by a piece of legislation that legislator has what amounts to a free vote on a particular issue. I realize that it may be more complicated because of partisan politics. For example an issue may not matter to a particular Republican legislator's constituents but it may be important to the statewide Republican party.