Buh-Bye

Hillary Clinton’s chief strategist — she inherited Mark Penn from her husband — has left the campaign. Here’s the official explanation:

Penn realized that he needed to step down after it was discovered this past week that Penn, who also is chief executive of the lobbying and public relations firm Burson-Marsteller Worldwide, had been hired by the Colombian government to help secure a trade deal that Sen. Clinton has said she opposes, sources told ABC News.

Or it could be a case of rats leaving a sinking ship — but I somehow doubt it.