I don't agree with this title. The left does care. They're deeply concerned that the WMD story could wipe their precious prison abuse story off the front page and take away one of their major talking points.
I disagree. At its heart, the opposition to the Bush administration is based on fundamentally different opinions regarding socio/economic policy.
Iraq is just a diversion - another reason to hate Bush. WMD, prison scandals, et al, regardless of their respective truth/falsity, merely provide texture to the opposition's primary cause, mainly, promotion of social democracy.