MoveOn.org and their pick for Obama's Supreme Court nominee

So I figured I'd stroll on over to my favorite site, MoveOn.org, to see wat they were up to.  And right at the top of the page was a call for people to sign a petition to President Obama that told him who they want for a Supreme Court nominee.  I found it hilarious.  Here it is:

"President Obama: Choose a Supreme Court nominee who has a track record of standing up for everyday Americans and who will oppose efforts by right-wing justices to expand the power of corporations." 

So, uh, what about that Constitution thing?  Aren't Supreme Court Justices supposed to have a track record of upholding what the Constitution says?  It's not about blocking right or left wing politics.

I find it funny.  Surprising?  Absolutely not, I've come to expect this kind of thing from groups like this.