Second Republican Debate Shows Long Campaign Road Ahead

On one of Donald Trump's most measured nights as a presidential candidate, it was his Republican rivals who turned up the volume on Wednesday, quarreling about their records, complaining about the questions and interrupting each other during a three-hour marathon debate that suggested the party's nomination battle is still a long way from being settled.

Standing center stage for the second debate of his short political career and flanked by 10 other contenders, Trump was involved in plenty of crossfire, much of it by his own making. The Republican front-runner mocked Wisconsin Governor Scott Walker's deflating poll numbers, ridiculed Senator Rand Paul's appearance, and refused to apologize for blaming former Florida Governor Jeb Bush's pro-immigration policies on his Mexican-American wife.