JOHN TANNER (D-TN) TO RETIRE: “If incumbents begin to believe this will not be a good year for their party, a wave of retirements could materialize. . . . After all, the thinking goes, if a longtime leader of the Blue Dogs decides now is the time to hang it up, what does that say for others in his position (like MO’s Ike Skelton, AR’s Marion Berry or WV’s Alan Mollohan)? They’ve all skated to re-election in recent cycles, yet all saw their CDs go quite strongly to McCain.”