CNN Ariz. Poll: Santorum Tied with Romney

On the eve of the last Republican presidential debate before next month's Super Tuesday contests, a poll indicates that Rick Santorum might be closing the gap with Mitt Romney in Arizona, which votes next Tuesday.

Roughly one-third of all likely voters surveyed in the CNN/Time/ORC International Poll released Tuesday say they could change their mind between now and Feb. 28.

The poll shows 36 percent of people likely to vote in Arizona's Republican primary say they back Romney, and 32 percent say they’ll vote for Santorum. Romney’s 4-point margin is within the poll's sampling error, meaning he and Santorum are basically tied.

The poll indicates that 18 percent back former House Speaker Newt Gingrich, with 6 percent supporting Rep. Ron Paul of Texas and 6 percent unsure. Surveys conducted earlier this year by other organizations indicated Romney had a larger lead.

The four major GOP White House hopefuls will face off at 8 p.m. Eastern Time Wednesday at a CNN/Republican Party of Arizona debate in Mesa, the first GOP showdown in nearly a month. Watch it live on CNN TV, CNN.com and CNN’s mobile apps.