From the Radio Times page at whyy.org:
Hour 1
Philadelphia mayoral race update. Today is the deadline for major party candidates to turn in their petitions. They will each need one thousand valid signatures to appear on the May 15th primary election. We'll get an update on what's been happening in the race with MARCIA GELBART, the City Hall Bureau Chief for The Philadelphia Inquirer who is covering the mayor's race, and contributing to the paper's Mayorpalooza blog, and from GAR JOSEPH, the city editor and political editor for The Philadelphia Daily News.
Like I always do when I'm plugging Radio Times, I remind you that you can listen live to the program by clicking here at 10am and choosing the method that works best for you.
(edited to add) If you missed it, you can use this link to get a downloadable .mp3 file of the show for your personal .mp3-playing device. IMPORTANT: It won't be available until 12:15pm today but when it is, just right click on it and hit "save as" and you're on your way to one heck of pod-castic experience.
By the way, Hour 2 is pretty darn interesting too, but for an entirely different reason.