Barack Obama has been musing about the benefits of Australian-style, compulsory voting. Nothing would scare Republicans more than that sort of law, especially in this period of demographic change.
The people who don't vote, the marginalized (code for poor and minority), probably aren't fond of those who wear the boot that's been on their neck all these generations. I expect the same holds true for the disaffected youth vote.
Know who else would be crawling out of their leathery hides if such a thing came to be? The Koch brothers (Lothar und Wolfram), the entire Adolf Coors family, Sheldon Adelson, Mittsy Romney, Ted Nugent, Team FOX News and that whole gang of thieves and brigands.
It's an awfully fine idea. Can you imagine Stephen Harper transformed into electoral ground beef, extra fat?