When asked for an explanation by Fox News' Sean Hannity Monday, Santorum neither confirmed nor denied his wording, only saying that he didn't recall.
"I haven't heard the context of the question," he explained. "I haven't heard it. All I can say is that I don't single out any one group of people. That's one thing I don't do. I don't divide people by group or race or class.
"I condemn all forms of racism," he added.
Rep. Michele Bachmann of Minnesota today was joined on the campaign trail by her colleague, Rep. Steve King, but the influential Iowa politician -- who went hunting with Santorum over the holidays -- declined to endorse anyone.
"I've got my prediction," King said when asked by ABC News who he thinks would win Iowa. "I can put them in a sealed envelope and sign my name across it."
The caucuses convene at 7 p.m. CST tonight. While Iowa is important -- the state will send 28 delegates to the Republican National Convention -- it is not necessarily an indicator of the political mood in the rest of the country.
Many candidates, such as John McCain, lost the Iowa caucuses but went on to win their party's nomination. Still, it is regarded an important kickoff to what could be a long race.
In this election cycle, candidates have spent roughly 342 days in Iowa and, as of Monday, they had held 973 events and traveled more than 23,000 miles.
ABC News' Emily Friedman, Elizabeth Hartfield and Chris Good contributed to this report.