The line is not thin, it doesn't exist. All lobbying is corruption. If it were not none of the parties would object to all of the proceedings and data being public.
> All lobbying is corruption
Not all of the parties do object to that, so, no, not all lobbying is corruption. Writing to your representative is lobbying.
> All lobbying is corruption
Not all of the parties do object to that, so, no, not all lobbying is corruption. Writing to your representative is lobbying.