Romney: How Dare Santorum Endorse Someone like Me!

Alec MacGillis at the New Republic makes a phenomenal point (which is what it takes for me to link to something at the New Republic) about how ludicrous Romney's attacks on Santorum's Specter endorsement are:

Santorum is being pilloried for having endorsed against a primary challenge a sitting senator from his own party and his own state who was also endorsed by the Republican president at the time. The senator he endorsed was pro-choice and went on to vote for universal health care legislation. Santorum is being attacked for this endorsement by a man who himself was pro-choice and signed into law universal health care legislation. So Santorum's crime, in Romney's eyes, is to have endorsed someone whose moderation resembled that of ... Mitt Romney.