The Emocracy poll has far more ballots than do the Score, Approval, and Plurality polls. More ballots is, of course, a good thing.
Maybe the additional voters are from the Daily Kos website. Does "Kos" stand for "keep out sincerity"? :-)
A few comments are in order:
1. If the heavily Democrat Daily Kos website members were invited to participate, then it's essential that an equivalent Republican website, and a Greens website, be likewise invited to participate. Balance, sampling fairness, requires that no faction or party be invited more than the others.