Fun browsing for a Sunday: Time magazine photographer Callie Shell has a wonderful collection of photographs she has shot of Barack Obama. Check out Obama in Muscatine, Ia., waiting in a stairwell while he’s introduced to a crowd for the umpteenth time. There’s also Obama and Michelle on the campaign bus, looking weary but immaculately put together. Shell says she rarely asks for portraits, but convinced Obama to mug one afternoon on his bus. It became the Time’s iconic May 17 cover, declaring Obama the winner of the Democratic nomination.