If it equally siphons, yes. But whenever we've had a 3rd party candidate that garnered any attention, that candidate siphoned only from one party, not the other, thus giving the other the victory. Until there is truly a 3rd, established party that won't automatically put one of the two parties we currently have in the White House, it won't work. I don't think this country will ever have 3 major parties; not in my lifetime anyway. And as I said, as it currently stands, I will likely never not vote for the democrat for president as the Supreme Court nominations are too important to me.