http://time.com/373/congress-is-now-mostly-a-millionaires-club/ About 5 years ago the number was around 44%.
Being a dollar millionaire isn't a bad thing. Provided there is a mix of people. You should compare it to Britain. The vast majority of influential politicians (ie the cabinet) are:- 4th, 5th, TENTH generation inherited wealth. exclusively from £50k pa high schools (mainly 1 or 2 schools, but rarely outside of a dozen schools) worth about £10m or £20m or MUCH more(all inherited). in quite a few cases, secret homosexual paedophiles. Never did a "real job" in their lives. Ofcourse there is SOME diversity in British politics. Like a short haired black lesbian feminist or two.