Herman Cain has captivated Republicans hungry for an alternative to Mitt Romney. But the presidential hopeful has made a series of stumbles that have left some questioning whether he's ready for the White House.

The Georgia businessman has been on a media blitz since a rise in the polls catapulted him into the top tier of the race for the Republican Party nomination. But he has sometimes appeared to be in over his head.

In the last week, Cain has struggled with questions of abortion rights, terrorist negotiations and even whether he wants an electrified fence along the U.S. border with Mexico.

Cain chalks up the reversals to the race's breakneck pace. He says he isn't flip-flopping but explaining, in his words, "what I really meant."