It's pretty revealing that, when casting about for a plan to oppose Supreme Court nominee Elena Kagan, the Republican National Committee decided to accuse her of not loving the Constitution enough. The item that the RNC thought was so dynamite? Kagan had quoted her mentor, Justice Thurgood Marshall, on the subject of the "defective" Constitution -- that is, the document that allowed slavery, denied women the vote, etc. Alex Pareene already took the RNC to the woodshed yesterday over this ridiculous argument. (Even in backtracking, the RNC seemed to dismiss, or not know about, Marshall's crucial role in overturning segregation,...