Nineteen percent of Republican primary voters said they support Romney, the former Massachusetts governor, 15 percent said they back Gingrich, the ex-House speaker, and 14 percent said they favor Santorum, the one-time U.S. senator from Pennsylvania, results released Monday indicated.
U.S. Rep. Ron Paul of Texas was fourth among Republican primary voters with 10 percent, followed by Texas Gov. Rick Perry with 6 percent and former Utah Gov. Jon Huntsman, who concentrated on New Hampshire, with 4 percent. "Someone Else" captured 19 percent.
After his narrow victory in Iowa -- Romney beat Santorum by eight votes -- 55 percent of Republican primary voters said they expect Romney to be the Republican nominee for president, results showed.
Registered voters nationwide agree.
CBS News pollsters said, however, that nationally the race for the Republican nomination is fluid and most voters have indicated they haven't settled completely on a candidate.
Results are based on a nationwide telephone survey of 1,413 voters conducted Wednesday through Sunday.
The margins of error are 3 percentage points for the overall sample, 3 percentage points for the sample of registered voters and 5 percentage points for the sample of Republican primary voters.