(CNN) - Ron Paul will hit the trail in Iowa on Monday with his son, Republican Sen. Rand Paul of Kentucky, to make a final pitch to caucus goers in the Hawkeye State.
The father-son duo will embark on a whistle-stop tour, visiting five counties one day before the nation's first Republican nominating contest on Tuesday.
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Sen. Paul, a junior senator who rode the tea party wave to election in 2010, last week appeared in a Christmas Day television ad for the Texas congressman.
"My father taught me the value of commitment to faith, family and our constitution," the Kentucky senator said in the ad. "He's always stayed true to his principles and convictions."
Sen. Paul also stumped for his father over the summer ahead of the closely-watched Ames Straw Poll in Iowa, returning the favor after his dad campaigned for him during his Senate run last year.
"We were privileged to witness the historic occurrence of a sitting U.S. Senator campaigning for his father, a sitting member of the U.S. House of Representatives," said Paul's Iowa Chairman Drew Ivers in a statement. "Now, we are seeing Senator Paul support his father on the eve of the pivotal Iowa Caucus where we are hopeful that Ron Paul achieves a strong top-three finish."
Paul has seen his momentum swell in recent days, as several Iowa polls show him surging to front-runner status.
According to the latest CNN/TIME/ORC International Poll, Paul placed second among likely GOP caucus goers, pulling in 22% of support and trailing Romney by three percentage points, a margin well within the sampling error.
- CNN's Shannon Travis contributed to this report.