cherrybim: The figures I cited come from a newly released data-laden report from the Pew Research Center entitled “A Portrait of American Orthodox Jews”, dated August 26, 2015. It is available on their website. The JTA has an article on it, dated the same day, entitled “Most Orthodox Jews are Republicans and 11 other findings from Pew”.
The percentage of American Orthodox Jews aged 30 and younger that are Chareidim is significantly higher than the 2/3 overall figure mentioned above.