It's been a thrilling—and harrowing—roller coaster ride for Wisconsin Governor Scott Walker.
First, the Republican presidential candidate suddenly rose and broke from the pack with a well-received speech at the Iowa Freedom Summit in January, where he repeatedly brought the crowd to its feet with thunderous applause. Almost immediately afterward, support for Walker surged. Iowa polls conducted during late spring and early summer showed him with almost enough support to potentially win the state's Feb. 1 first-in-the-nation caucuses amid an unusually crowded field.
