I'm not so sure. Corbyn built the biggest political party membership in Western Europe, and polling in the US indicates that Bernie Sanders' policies are popular across party divides (when those questioned don't know whose policies they are). In both cases the establishment came out in force against them, and they are both subject to bias from propaganda (both current and leftover from the Cold War). Regardless, with very few exceptions, politicians in the US are tools of corporate interests and lobby groups. There is a similar revolving door between politics and business in the UK, though we try to keep the vulgar displays of it a bit more under the rug.