Found this in the "Issues" section of Obama's website:
Improve Transportation Access to Jobs: As president, Obama will work to ensure that low-income Americans have transportation access to jobs. Obama will double the federal Jobs Access and Reverse Commute program to ensure that additional federal public transportation dollars flow to the highest-need communities and that urban planning initiatives take this aspect of transportation policy into account.
Couldn't find anything on Hillary Clinton's site, but it's nice to know that public transportation is on the radar of at least one presidential candidate (and the frontrunner to boot).