What Happened to the Party of Lincoln? Unbeatable Trump Makes the GOP Scramble 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 Republican presidential candidate Donald Trump greets guests after speaking at a campaign rally at Burlington Memorial Auditorium on October 21, 2015 in Burlington, Iowa. ( Scott Olson / Getty ) Produced by Cameron Drews Produced by PRI and WNYC