Many journos who use Twitter place the disclaimer “RTs don’t constitute endorsement” (or some variant) in their bio, presumably to keep up the illusion of not having an opinion on politics, which they can therefore cover objectively.
It’s really kind of a silly claim, but that’s the modern j-school mindset at work here in the U.S.
Still, what’s fun about Twitter is that those journos who do a fair amount of RTing — say, the Houston Chronicle‘s leftwing bureau