Romney increased his lead in the delegate count with a commanding victory in Puerto Rico, which held its primary Sunday. He was poised to claim all 20 delegates in the U.S. territory, where both he and Santorum campaigned hard in recent days. Santorum spent Sunday in Louisiana, which holds its primary Saturday, casting himself as an underdog and speaking of his candidacy in religious terms. "One of the great blessings I've had in every political campaign is people underestimate me, people underestimate what God can do," Santorum said at a Louisiana church. But the focus of the race was on Illinois, where both men will be campaigning on Monday. This latest battleground in the Romney-Santorum rivalry holds an open primary Tuesday that will award 54 bound delegates proportionally and provide a jolt of momentum to the victor. Romney is hoping a pocketbook pitch will pull women voters toward him and increase his lead over the former senator from Pennsylvania. At each stop Sunday, Romney repeated his call on Obama to fire the "gas hike trio" - Energy Secretary Steven Chu, Interior Secretary Ken Salazar and Environmental Protection Agency Administrator Lisa P. Jackson. "You've got moms that are driving their kids to school and practice after school and other appointments and wonder how they can afford putting gasoline in the car, at the same time putting food on the table night after night," Romney told supporters at a pancake breakfast in Moline, Ill. This president doesn't understand the economy. It's time to put in place an economic heavyweight, and I am, and I'll get that job done," added Romney, who worked 25 years as a businessman before launching his political career. Obama campaign adviser David Axelrod responded to Romney's attacks in an interview on CBS's "Face the Nation" in which he criticized the former Massachusetts governor's record. "If he thinks he's an economic heavyweight, he must be looking in a funhouse mirror, because that is not the record of an economic heavyweight," Axelrod said. Ann Romney, who campaigned alongside her husband Sunday, was more direct in her plea to women voters. "I love it that women are upset, too," she said of Obama's record. Women are talking about the economy. I love that. Women are talking about jobs. Women are talking about deficit spending. Thank you, women. We need you. We all need you in November, too. We have to remember why we're upset and what we've got to do to fix things. The economy has been the bedrock issue of Romney's campaign, but he has rarely spoken of it in such populist terms. At campaign stops Sunday, he recalled recently meeting a landscaper in St. Louis whose team can hardly afford to fill up their trucks to get to sites.