Sean Trende weighs in on why neither candidate can move the polls.
Nate Silver argues that Obama may be stronger than his approval ratings.
Karl Rove says Obama's numbers are bad.
Alan Abramowitz revises his model, predicts very close 2012 election.
Matthew Yglesias laments "perverse incentives" that produce polls of battleground states.
Media Matters takes on a conservative survey of doctors.