The clause that progressives lean on

The commerce clause!

The perversion of the interstate commerce clause

Interesting video on the interstate commerce clause and the decision by the Supreme Court to weaken it; this affects more than just wine sales to other states, it also negatively impacts the sale of health insurance policies across state borders. Since some states have imposed community rating and community issue mandates on the health insurance sold in their states, this has exacerbated the fiefdom and oligarchy of insurance companies that never have to worry about competition from other companies in other states.