The choice to [promote health care reform] instead of focusing narrowly on getting the economy back on its feet and getting the unemployed back to work, amounts to putting partisan politics before the economic welfare of struggling Americans.
This is deeply deceptive rhetoric. "Partisan politics" could mean one of two things. In this context, Will presumably means nothing more than that the substantive policies in question are opposed by Republicans. But there's obviously nothing necessarily wrong with "partisan politics" in this sense. After all, it's possible for an opposition party to oppose good policy proposals -- proposals which may, for all Will has said here, do more to improve the "welfare of struggling Americans" than a narrow focus on improving the economy would. (I take no position here on the actual policy merits. I'm just pointing out that, as a conceptual matter, this objection is inane.)
Alternatively, talk of "putting partisan politics [first]" may be taken as an accusation of bad faith: rather than trying to implement worthwhile policies, one is thought to be merely acting for "partisan gain" -- to increase one's electoral chances, or some such. This would be a very serious accusation.
The first interpretation makes it easy to claim that one's opponents are "putting partisan politics first". The second interpretation makes "putting partisan politics first" sound like serious wrongdoing. One can understand why a partisan hack would thus be tempted to equivocate in this way. What I can't understand is why Will would want to sound like a partisan hack.