Article Photos: Romney Medicare plan: Key details still in flux



Republican presidential candidate and former Massachusetts Gov. Mitt Romney uses aide Garrett Jackson's back to sign a shirt for a volunteer before he boards his campaign plane in San Francisco,Saturday, Sept. 22, 2012. (AP Photo/Charles Dharapak)

Republican presidential candidate and former Massachusetts Gov. Mitt Romney uses aide Garrett Jackson's back to sign a shirt for a volunteer before he boards his campaign plane in San Francisco,Saturday, Sept. 22, 2012. (AP Photo/Charles Dharapak)