Scoring the politicians based on their support for the constitution and especially human rights, plus encouraging the vote, could fix this after just an election cycle or two.
http://www.washingtonpost.com/blogs/post-politics/wp/2014/11...
Though, for some reason, voting and "democracy" elicit such warm conditioned feelings that people are willing to desperately scrape for examples of whatever small local victories they've secured in order to justify that it's worth going through the whole jungle. Electoral reform, though? Dead end.
The problem today is that certain groups (poor, young, ethnic minorities) are less likely to vote and thus have less of a voice as a group. There are systematic changes that could be made to encourage more representative voting, such as easier voter registration practices and a national voting holiday. Australia even imposes a small fine for not voting, which surely would not sit well with many in America but would probably be a good thing for our republic.
If people cared about this.
Plug-ins are nice for us concerned techno-citizens, but most people don't care and it won't change things directly that fast. I think the media needs to do its job of informing us rather than entertaining us, and schools need to train vigilant citizens rather than compliant ones.