Santorum Says He’s In GOP Race For The Long Haul [VIDEO]

Rick Santorum says he's in the GOP presidential race for the long haul even though rival Mitt Romney has a big edge in delegates, campaign cash and organizational resources.

Santorum tells CNN's "State of the Union" that "we're in this to win" and that there's too little difference between Romney and President Barack Obama to satisfy conservative Republicans.

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Santorum says conservatives want a chance to nominate a conservative to take on the Democratic incumbent and "we're going to give them an opportunity."

The former Pennsylvania senator hasn't qualified for the ballot in all the states on the election calendar and sometimes has had trouble fielding full slates of delegates in some states.

But he says he's doing pretty well with scarce resources, compared with the deep-pocketed Romney campaign.

PUERTO RICO GOES TO THE POLLS

Another critical primary looms Tuesday and Republican presidential front-runner Mitt Romney left Puerto Rico early for more campaigning in Illinois.

Puerto Rico holds its primary today and the debate over statehood in the U.S. territory is an underlying factor. Puerto Ricans will vote on the island's status in November.

In Illinois, polls have shown Romney slightly ahead of Rick Santorum and Romney aides say then see-saw nature of the race so far means they're not taking anything for granted.

Santorum was also in Illinois yesterday afternoon, where he went on the attack against Romney.

Romney has a full day of campaigning in Illinois today, with three campaign stops and an appearance on Fox News Sunday.