Republican primaries 2012 (56 images)

Republican presidential hopeful Newt Gingrich greets supporters at a rally on March 15, 2012 in Lake in the Hills, Illinois. UPI/Brian Kersey

Republican presidential hopeful Newt Gingrich (R), with his wife Callista, speaks to supporters at a rally on March 15, 2012 in Lake in the Hills, Illinois. UPI/Brian Kersey

Republican presidential hopeful Mitt Romney holds a baby as he greets supporters at a campaign stop at a restaurant on March 16, 2012 in Rosemont, Illinois. UPI/Brian Kersey

Republican presidential hopeful Rick Santorum makes a campaign stop at John Hersey High School on March 16, 2012 in Arlington Heights, Illinois. UPI/Brian Kersey