Marketing and lobbying are different things, using different tactics and techniques, and the various individuals have different sets of skills.
This is the primary definition of lobbying and marketing. The focus of a lobbyist is a public official. The focus of the latter is a consumer or customer.
seek to influence (a politician or public official) on an issue.
Marketing refers to activities a company undertakes to promote the buying or selling of a product or service. Marketing includes advertising, selling, and delivering products to consumers or other businesses. Some marketing is done by affiliates on behalf of a company.F
Of course, we can all be our own lexicographers. The aforementioned "American Egg Board" like employees both marketers and lobbyists.
There is a clear distinction as to their focus, function, and training.