Between 2002 and 2006, I noticed a meta-narrative that appeared in the blogosphere every so often:

1) Policy X is promulgated;

2) Policy X is generally acknowledged to be bad by policy wonks across the ideological spectrum;

3) The left half of the policy-wonk blogosphere blames Republicans for being responsible for implementing said idiotic policy;

4) The right half of the political blogosphere responds by pointing out the complicity of several Democrats in getting political approval of the policy;

5) The left half responds that this is besides the point, because the Republicans hold all the levers of power, so they're the ones who are to blame

6) Raucus name-calling debate ensues.

For Exhibit A, see this Mark Thoma post about protectionist Republicans. His basic point:

There has been attempt after attempt to portray the trade issue as an area where Democrats are deeply divided, and there has been much written about how Democrats will stifle trade and hurt the economy now that they are in power.

But the split is not unique to Democrats. As with immigration, Republicans are no less divided on this issue....

The point here is not to answer all the questions that surround the trade issue, but simply to emphasize that the divisions that exist are not confined to a particular party no matter what some pundits would have you believe.