Mentioned without (much) further comment
But was this true? Even though I hadn't remembered hearing the term "moderate Democrat", perhaps I wasn't listening for it. So a quick visit to news.google.com came to the rescue. And the results are:
Draw your own conclusions.
UPDATE: Doing the same search on news.yahoo.com resulted in 541 Moderate Republican articles versus 50 Moderate Democrat articles (almost 11 to 1). And doing the search on nytimes.com resulted in 1193 Moderate Republican articles versus 293 Moderate Democrat articles ("only" 4 to 1).