George Will on Austan Goolsbee

It is rare that an Op-Ed is written praising an economist.  It makes many good points but there is one unjustified slap:

Goolsbee no doubt has lots of dubious ideas — he is, after all, a Democrat — about how government can creatively fiddle with the market’s allocation of wealth and opportunity.

Does the use of "no doubt" mean Will actually knows this?  But the next sentence comes and the piece closes on a different note altogether:

…he seems to be the sort of person — amiable, empirical and reasonable — you would want at the elbow of a Democratic president, if such there must be.