Separately, we have no proof of ESP's political leanings on way or the other. Just because she employs migrant workers doesn't indicate anything. Vermont is one of the oldest states in the nation and speaking from personal experience, it's extremely hard to find workers willing to undertake manual labor, especially in seasonal industries such as farming. Roughly half the landscaping and construction crews that I have come across have some sort of migrant labor. The going rate in Chittenden Country Vermont (where I live) for this type of work starts $20 / hr for warm bodies which evictions, convictions, and whatever else. If you are reliable, it goes up to $25 / hr pretty quickly. That's true no matter your background. Further, most of these people, migrant or domestic, are classified as seasonal workers. In the winter, some travel to warmer climates like Texas, some stay and work in ski resorts, some claim unemployment, and some return to Mexico.
Differentiating an illegal migrant laborer from a legal one is beyond the scope of most employers. They are required to make a good faith effort to verify someone's identity, but this obviously can easily be faked. It is not the responsibility of the employer to play the role of USCIS and undertake forensic accounting.
Here is the latest news from the outlet that broke the story: