MYRTLE BEACH, S.C. -- With new calls on Monday for Republicans to rally around Mitt Romney as their presidential nominee, some conservatives showed new signs of fracturing despite a vote over the weekend by religious leaders to coalesce behind Rick Santorum as an anti-Romney alternative.

Jon M. Huntsman Jr., the moderate former governor of Utah whose candidacy did not live up to its early promise, dropped out of the race and endorsed Mr. Romney, saying, ''It is now time for our party to unite around the candidate best equipped to defeat Barack Obama.

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