[epakai]

There's a lot they can do. Lobbyist at a minimum have the same access to a politician as you do. They can make phone calls, send letters, attend and speak at legislative hearings, or try to be involved in the right social circles. Building this social element is important for their continued success and gives them access beyond what a typical person could normally obtain.

More importantly they have influence because some group has a moneyed interest in legislation. This can give them the resources to do the above regularly. They might hire legal counsel to sue governments. They may be able to lend support to pet projects and gain support for their own goals.