While I agree it is probably best as an artist to keep your political views to your self and not risk alienating your audience, its probably safe to say that the EDM audience is younger than the average American, and is therefore more likely to be liberal- so assuming a 50-50 split is probably premature. Not to mention, the EDM audience has historic ties to groups like the gay community, which are also far less like to be Republican, so again the assumption of a 50-50 split is probably incorrect.