Santorum Focuses on Pennsylvania After Romney Takes Illinois Delegates Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Rick Santorum and Mitt Romney debate on February 22, 2012 in Mesa, Arizona. ( DON EMMERT / Getty ) Produced by Hsi-Chang Lin and Mythili Rao Produced by PRI and WNYC