Dick Morris then and now.
People certainly can change their opinions (flip-flop!) as either new information comes or even as they just reconsider their thinking. I write a hell of a lot so I'm certain Little Russ could subject me to the dreaded Russert treatment on some issue or another. Still, when pundits radically change their position it'd be nice if more often we'd get an acknowledgment of that change and more importantly an explanation for the change in thinking.