Indeed, the theme of presidential arm-twisting again ignores history. Clinton once taught Sen. Richard Shelby of Alabama a lesson, cutting out jobs in Huntsville, Ala. That worked well enough that Shelby switched parties, joined the Republicans, and became a reliable vote against Clinton. George W. Bush and Karl Rove decided to teach Sen. Jim Jeffords a lesson, punishing dairy interests in Vermont. That worked even better — he switched to independent status and cost the Republicans their Senate majority. Myths are so much easier than reality.