I just went through my pocket Constitution and the 27 amendments, and I couldn't find what you mentioned. (24 maybe?)
Universal manhood suffrage was enacted by Congress in 1826 and signed by John Quincy Adams. It was not a constitutional amendment.
The Amendments listed below, coupled with recent legislative innovations like Motor Voter and the good old Voting Rights act of 1965, have in effect established “Universal Suffrage” in the USSA.
The Founders specifically did not put a right to vote in the Constitution, and warned against expanding the Franchise to the poor, women, and those under 21, these groups being exactly the ones that these days vote for domestic marxists.
Their warnings were not heeded.
The Fifteenth Amendment prohibited discrimination of the right to vote based on race or former status of involuntary servitude.
The Nineteenth Amendment prohibited discrimination of the right to vote based on sex.
The Twenty Fourth Amendment prohibited the use of a poll tax.
The Twenty Sixth Amendment allowed all citizens over the age of 18 who are not otherwise disqualified the right to vote.
Read more: http://wiki.answers.com/Q/Which_of_the_27_amendments_expanded_voting_rights#ixzz22X9mKFKr