Jim Johnson, the just-departed adviser to Sen. Barack Obama who was leading the effort to screen vice presidential candidates, was simply in the wrong place at the wrong time, argues Marc Ambinder of The Atlantic: “In many respects, the times and the man just didn’t jibe. Johnson is extremely well-liked and well-respected, and is a Washington insider, and a man very much identified with mortgages. And Obama is an outside-Washington change guy. The veep choice is extremely important.” 0612perceptions_ssv_20080612072350.jpg Jim Johnson, leaves a meeting on Capitol Hill, Monday, in Washington. (AP Photo) Still, Ambinder wonders about the lingering questions: “Was...