i need to find criticism that the constitution does not fit the country anymore in today's society and should be revised.

Answer 1

http://www.usconstitution.net/consttop_newc.html

http://www.darkhorsecandidate.com/constitution.html

http://en.wikipedia.org/wiki/Convention_to_propose_amendments_to_the_United_States_Constitution

Answer 2

the famous John Brown of Civil War fame might be a place to start. a great hero, he advocated a new constitution with racial equality as a mainstay in it. perhaps someone writing about John Brown would advocate his views today.