It's a frustrating status quo, but it's also an opportunity for our next President to make public transit a priority. In addition to posing for photos on the subway, the candidates should tell us in detail how they will fast-track modern signal systems so we can run more trains and alleviate crowding. How they will fight for new revenue sources so the MTA can scrap "Mad Men"-era subway cars. And how they will rebuild American cities by upgrading and expanding transit systems to match 21st century needs.