MSNBC, which is a cable news channel in precisely the same sense that a gentlemen’s club is a club for gentlemen, has been doing a public service by collecting its tedious liberal operating assumptions into a series of advertisements, the “Lean Forward” campaign. If you want to know more about the obscure motives of the agitated and fitful little hamster turning the neocortical wheel inside Rachel Maddow’s apparently impenetrable noggin, then by all means have a gander at these commercials at msnbc.com. If, on the other hand, you have a full and productive life, with family and professional obligations, hope …