[I fell behind a bit on his feature over the last hectic week, so some of these are a little stale].
Kathy Frankovic considers the reasons for conflicting national numbers from CBS/NYT and Gallup earlier this week (see also my post on this topic); last week she had a terrific review of how question order can affect survey results.
CJR"s Clint Hendler takes an in-depth look at the various popular vote counts.
David Hill says "every superdelegate can find one survey that confirms the outcome he or she intuitively prefers for the Obama-Clinton fight.
Jay Cost crunches the exits from IN and NC
John Cohen finds that most Republicans voting in IN and NC express "little other than a sincere preference for Clinton over Obama."
Brian Schaffner notes that turnout in IN and NC "exceeded the number of votes Kerry won in the states in the general election"
PPP"s Tom Jensen tips his hat to SurveyUSA's Jay Leve