On the eve of Tuesday's crucial multi-state primaries, a sharp new divide erupted between Republicans who pledge to fall in line behind Donald Trump if he wins their party's nomination and others who insist they can never back the bombastic billionaire.
The fissure could have major implications beyond the primaries, exposing the looming challenges in uniting the party, no matter who wins the nomination.
Trump has won three of four early nominating contests, panicking a party that had assumed his populist appeal with voters would fizzle. Instead, he's only grown stronger and appears to be in commanding position heading into Super Tuesday, the biggest single-day delegate haul of the year.
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