How many new caucus-goers will feel the Bern?

If the caucus were just about the current universe of voters, it would be easier to predict and would lean even more toward Clinton. But that is not how it works as the Democrats allow same-day registration.

Thirty thousand new voters registered on Caucus Day in 2008. No one expects it to get that high Saturday, but that uncertainty is what makes polling so difficult and nervousness so prevalent in Clintonland.

Both campaigns are now calling independents and telling them they can switch to the Democratic Party on Saturday and participate. But how many will do so? And how many Republicans — Sanders is calling a lot of them — will become Democrats for a day just to try to skew the results?

Have I mentioned why primaries are better than caucuses? Have I mentioned that this kind of nonsense is why Nevada may lose its early-state status.