Morning Edition

Saturday is South Carolina's Republican presidential primary. It's also the second anniversary of the Supreme Court's famous Citizens United decision.

That's the case that allows corporations to explicitly support or attack specific candidates. The day will be marked with attack ads — and protests.

The Republican presidential race has covered just three states so far. And superPACs linked to candidates Mitt Romney, Newt Gingrich, Rick Santorum and Ron Paul have spent a total of $20 million. They're feeding voters a heavy diet of negativity.

The Iowa Republican Party has certified the results of its caucuses earlier this month. Rick Santorum is 34 votes ahead, but the party will not declare a winner because there are missing results in eight precincts. Before the certification process, Mitt Romney had been declared the winner.

David Greene has business news.

Renee Montagne has the Last Word in business.

On the campaign trail, GOP presidential candidate Rick Santorum often discusses his opposition to abortion rights and gay marriage. That message served him well in Iowa with its large contingent of evangelical voters. Christian conservatives are also dominant in South Carolina, which votes Saturday. Santorum hopes to repeat his Iowa performance, but he's been struggling to keep pace in polls.