The Rest of the Story
From the Great and Powerful Kos, the real reason for the Republican jihad against SCHIP (culminating in their embarrassing attacks against a 12 year old boy and his family): they fear, as with Hillarycare in '93, that success will remind middle-class voters that they have far more in common with the working poor than they do with the economic aristocracy the GOP supports. One of the linchpins of Republican electoral strategy since Reagan has been to make "entitlement" a dirty word and associate any form of government assistance with welfare queens and other undesirables. If even some of the large numbers of uninsured middle class families start seeing things otherwise, then the whole "government is the problem" argument falls apart.
UPDATE: Mitch McConnell beats up children. And he blatantly lied about it. Yes, I know; not much of a surprise, but it tends to fit in well with the above theory.