From an organised lobbying point of view, there do not appear to be any active "Vegan Lobby" organisations promoting plant based alternatives to meat in the US.
This New Republic Article lists the number of formal lobbyist for the meat and dairy industries, but says there are no equivalents for the The Vegan Trade Council.
A lobby, by definition, is a group of people (lobbyists) who are paid to persuade lawmakers to enact policy on behalf of an interest group. These lobbyists are often paid by trade associations which, in the food industry, include the International Dairy Foods Association, the North American Meat Institute, the National Pork Producers Coalition, and the National Chicken Council. Thus, there are currently 52 people registered to lobby on behalf of the dairy industry; 24 people on behalf of the poultry and egg industry; 34 people for meat products and processing; and 54 people for livestock.
The Vegan Trade Council, by contrast, has no lobbyists.
This is something that might change as the economic value of the sector is growing quickly.
From 2016 to 2017, plant-based food accounted for $3.1 billion in sales, an 8.1 percent increase from the previous year. The fastest-growing sector was plant-based dairy alternatives, which grew at a 20 percent rate.
But it will have to complete strongly against entrenched interests in the US and the EU. Soya Milk to Soya Drink
Council Regulation 1234/2007 clearly specifies that "the term milk shall mean exclusively the normal mammary secretions obtained from one or more milkings without either addition thereto or extraction therefrom". The same regulation also limits the use of other popular designations, such as cream, cheese and yoghurt for products derived from mammary milk.
Veggie Burger and Sausage
MEPs on the European parliament’s agriculture committee voted overwhelmingly to include the name ban in a package of food labelling regulations earlier this year, arguing that consumers are confused by the use of meaty names for non-meat products on packaging.