I've been looking for a good analogue to the willingness of Republicans to believe, or say they believe, that Obama was born abroad, and one relevant number is the share of Democrats willing to believe, as they say, that "Bush knew." There aren't a lot of great public numbers on the partisan breakdown of adherents to that conspiracy theory, but the University of Ohio yesterday shared with us the crosstabs of a 2006 poll they did with Scripps Howard that's useful in that regard. "How likely is it that people in the federal government either assisted in the 9/11 attacks...