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NEW ORLEANS (AP) -- The millions of dollars spent by Mitt Romney's allies on TV ads attacking his two main rivals have helped Romney pull ahead in the GOP presidential race. The resulting bitterness, however, is making it hard for him to lock down the nomination and end the party fighting that delights Democrats....

NEW ORLEANS (AP) -- The millions of dollars spent by Mitt Romney's allies on TV ads attacking his two main rivals have helped Romney pull ahead in the GOP presidential race. The resulting bitterness, however, is making it hard for him to lock down the nomination and end the party fighting that delights Democrats....

NEW ORLEANS (AP) -- The millions of dollars spent by Mitt Romney's allies on TV ads attacking his two main rivals have helped Romney pull ahead in the GOP presidential race. The resulting bitterness, however, is making it hard for him to lock down the nomination and end the party fighting that delights Democrats....

NEW ORLEANS (AP) -- The millions of dollars spent by Mitt Romney's allies on TV ads attacking his two main rivals have helped Romney pull ahead in the GOP presidential race. The resulting bitterness, however, is making it hard for him to lock down the nomination and end the party fighting that delights Democrats....

NEW ORLEANS (AP) -- The millions of dollars spent by Mitt Romney's allies on TV ads attacking his two main rivals have helped Romney pull ahead in the GOP presidential race. The resulting bitterness, however, is making it hard for him to lock down the nomination and end the party fighting that delights Democrats....

WASHINGTON (AP) -- Republican presidential hopeful Rick Santorum says the United States should either commit to winning the war in Afghanistan or "get out."...

WASHINGTON (AP) -- Republican presidential hopeful Rick Santorum says the United States should either commit to winning the war in Afghanistan or "get out."...

WASHINGTON (AP) -- Republican presidential hopeful Rick Santorum says the United States should either commit to winning the war in Afghanistan or "get out."...

WASHINGTON (AP) -- Republican presidential hopeful Rick Santorum says the United States should either commit to winning the war in Afghanistan or "get out."...

WASHINGTON (AP) -- Republican presidential hopeful Rick Santorum says the United States should either commit to winning the war in Afghanistan or "get out."...

WASHINGTON (AP) -- Republican presidential hopeful Rick Santorum says the United States should either commit to winning the war in Afghanistan or "get out."...

WASHINGTON (AP) -- Republican presidential hopeful Rick Santorum says the United States should either commit to winning the war in Afghanistan or "get out."...

WASHINGTON (AP) -- Mitt Romney added to his big lead in the race for convention delegates by winning Republican presidential primaries in Maryland and the District of Columbia....

WASHINGTON (AP) -- Heading into Sunday's presidential primary in Puerto Rico, all four GOP hopefuls added delegates when results were finalized from contests that happened days ago....

WASHINGTON (AP) -- Heading into Sunday's presidential primary in Puerto Rico, all four GOP hopefuls added delegates when results were finalized from contests that happened days ago....

WASHINGTON (AP) -- Republican presidential hopeful Rick Santorum met privately with conservative leaders on Thursday to craft plans to try to stop Mitt Romney's march to the nomination. Pressuring rival Newt Gingrich to leave the race was part of their overall strategy....

ST. LOUIS (AP) -- Former GOP presidential candidate Rick Santorum says no group has done a better job of promoting American freedom than the National Rifle Association....

NEW ORLEANS (AP) -- The millions of dollars spent by Mitt Romney's allies on TV ads attacking his two main rivals have helped Romney pull ahead in the GOP presidential race. The resulting bitterness, however, is making it hard for him to lock down the nomination and end the party fighting that delights Democrats....

SAN JUAN, Puerto Rico (AP) -- At El Sendero De La Cruz evangelical church, Rick Santorum sought prayers along with votes....

BAYAMON, Puerto Rico (AP) -- Looking toward the critical primary in Illinois, Republican presidential front-runner Mitt Romney wrapped up a shortened campaign trip to Puerto Rico on Saturday as he prepared for more tough contests against chief rival Rick Santorum....