It's too bad that his support for President Bush's war in Iraq provides such an easy explanation for the downfall of Sen. Joe Lieberman (D-CT). The pious prig from the Nutmeg State is almost the perfect Murder On the Orient Express figure: There are so many reasons to wish him ill that the real challenge shouldn't be finding suspects, but settling on just one. To have Lieberman's Iraq stance become the default reason for opposing him (among Republicans, of course, it's also been the only reason for supporting him) is just too easy. Lieberman is possibly the least libertarian...