Ihad been thinking for some time that more attention should be paid to Rush Limbaugh – not to what he says, because it is pretty much the same old rightwing bombast he has been selling for 25 years, but to what he has been urging his legion of 20m similarly inclined radio listeners to do. This is, wherever state laws allows, that they should register in a Democratic party primary and cast a vote for Hillary Clinton against Barack Obama, the front-runner to be the Democratic presidential nominee. He calls it “operation chaos” and he has been revelling in its...