What is a lobbyist? Who makes the best lobbyist?

Lobbyist is someone who is trying to adivice the legislation in support of distinctive interest. The best lobbyist are specialist that make the policy work for them.

A lobbyist is a person who is trying to exercise influence on people in power, most typically on legislators. A lobbyist can representant groups of associations of people. A good lobbyist is persuasive and well prepared, and has good data and arguments supporting them