It demonstrates that

>conservatives are married to a century-and-a-half-long campaign of doing whatever it takes to try to restrict voting along lines of identity (sex, race, class, location), and that liberals are the ones trying to get the citizens, of a country that prides itself on its free and fair democracy, to vote

The protected classes in question tend to vote with the Left. Therefore, the Right has largely, generally, in sweeping fashion, resisted the extension and protection of major portions of the Left's right to vote. "Never" is the correct word. You are wrong.