Sounds like Biden, career politician! (Although admittedly Biden enabled the vast US credit card usury industry out of Delaware with the private banking sector)
https://www.motherjones.com/politics/2019/11/biden-bankruptc...
https://www.motherjones.com/politics/2019/11/biden-bankruptc...
So not a lot of diversity, but even if that's regrettable, it's pretty ridiculous to blame Mélenchon for that.
Seems Biden only became a millionaire after his stint as VP, from book sales and speaking engagements. Being in Congress doesn't pay much.