I apologize if this is not an appropriate diary, but I've been searching all over this morning and can't find the answer to this one question that is bugging me.
When the Register projects that 45 percent of the participants in the Democratic Caucus will be no Democrats (40 percent Independents and 5 Percent Republicans),
Is that the opinion based upon their underlying poll of 800 registered voters, or is that just an assumption that they are making and if so where does it come from.
I had always assumed that the pollsters kept a constant "screen" so at least comparisons of trends were valid, but if they are changing their screen doesn't that make it an apples and oranges set of polls ?