Puerto Rico votes; GOP hopefuls keep pushing

Republican presidential candidates, former Pennsylvania Sen. Rick Santorum, former Massachusetts Gov. Mitt Romney, former House Speaker Newt Gingrich and Rep. Ron Paul, R-Texas, take the stage before the start of the Republican presidential candidate debate at the North Charleston Coliseum in Charleston, S.C., Thursday, Jan. 19, 2012. (AP Photo/Matt Rourke)
March 18, 2012 9:33:54 AM PDT
Republican presidential hopefuls Mitt Romney and Rick Santorum are campaigning in next-up primary states of Illinois and Louisiana, while Puerto Ricans get their say in picking the GOP's presidential nominee.

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