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Donald Trump Ahead in 11 of the 16 GOP Primaries Over the Next Two Weeks -
Walker Drops Out of GOP Presidential Race -
GOP Wants to Broaden Appeal; Will Candidates Get in the Way? -
GOP Candidates Vie to Break Out of Trump’s Shadow in Debate -
Trump Signs Pledge to Back GOP’s 2016 Presidential Nominee -
Donald Trump Courts Tea Party Voters in Nashville -
Trump Says He’s Proud He Booted Univision’s Ramos From Event -
Republican Contenders Scrambling to Adjust to ‘Trumpism’ -
Ohio Gov. Kasich Brings the Republican Field to 16 -
Bush Still With Much to Prove in Leaderless GOP 2016 Race