Where will Republican voters jump if frontrunners Donald Trump or Ben Carson tumble in the polls? Patrick O'Connor from the Wall Street Journal provides some answers.

Tim Reid from Reuters breaks down why Donald Trump has ramped up his attacks on rival Republican presidential candidate Ben Carson.

Katie Glueck from POLITICO explains why some Republican political strategists don't expect Ben Carson to win the GOP nomination even with his strong polling numbers.

Ben Carson vaults to lead in latest Journal/NBC poll, liberal fervor for gun control puts Senate candidates in tough spot and a Apple TV review.

Josh Kraushaar from the National Journal compares Ben Carson's success to that of Jimmy Carter's.