Dave Davies reports on SuperPACS buying ad time in the Philadelphia media market. Tom MacDonald brings news that the Philadelphia Parking Authority wants all cabs in the city to be wheelchair accessible by 2016. We talk to Bobby Livingston of RR Auction House about a rare letter penned by a Pennsylvania signer of the Declaration of Independence. Therese Madden reviews Michael Pollan’s rules for determining what’s food and what’s junk. And Jennifer Lynn talks to Danny’s Guitar Shop owner Danny Gold about his aspirations for a TV show on guitar repair.