These are the REAL covert agents, who can be hurt, if their identies are released, therefore the liberals are very happy to see it released, unlike Valerie Plame who worked IN the US and everyone already knew who she was.
The real story is that that CIA was undermining the administration by sending Wilson, who wasn't going to find anything, even if he tripped over some yellowcake.
It would be interesting to see the libs squirm with this one. I don't see it happening though... do you?