Foster McTeague,
Hmm, might want to explain that to the US Department of Justice, Civil Rights Division and their over sight on the Voting Rights Act, the National Voters Registration Act, the Helping Americans Vote Act to mention a few. 
Check out the Voting Section Litigation page. Cases brought and litigated under various sections of the voting and elections acts that you can read. Check out how many states, counties, and cities have been filed against and how they were settled. Alaska is there several times. 
You are saying the 19th amendment of the Constitution that gives women the right to vote wasn't really needed in order for women to vote in federal elections ? 
Federal regulation of voting comes from laws enacted by Congress that are Constitutional.
When I  say Constitutional that includes the amendments which are part of it and they speak fairly loudly at times. Don't forget that people in the territories get to vote in National Presidential Primaries for delegates.