Article Photos: York: For conservatives, the question: Who is John Roberts?



President Barack Obama and first lady Michelle Obama arrive at the Congressional picnic on the South Lawn of the White House in Washington, Wednesday, June 27, 2012. (AP Photo/Susan Walsh)

President Barack Obama and first lady Michelle Obama arrive at the Congressional picnic on the South Lawn of the White House in Washington, Wednesday, June 27, 2012. (AP Photo/Susan Walsh)