While Republicans tend to make it harder for people to vote through initiatives such as Voter ID requirements, Democrats tend to be in favor of measures which make voting easier, such as early and Election-Day registration. But do both measures advocated by Democrats actually have an impact on turnout? Barry Burden, David Canon, Ken Mayer and Donald Moynihan have examined vote returns across three presidential elections and find that while Election-Day registration laws are better at stimulating those who are on the fence to turn out – usually Democrats, early voting measures tend to encourage those who have already decided to vote – usually Republicans
