How valuable will the Washington Post endorsement be to Creigh Deeds in his quest for the Virginia governorship? So valuable that it already is prominently featured in a campaign ad … for his opponent, Bob McDonnell, who has a comfortable lead in polling. The GOP hammers one particular point in the endorsement repeatedly. Want to guess what it is?I’m reminded of a classic editorial cartoon by the late, great Jeff MacNelly, titled The Carter Endorsement – showing Carter as a relay runner and W