(CNN) – Mitt Romney has not yet decided on his running mate, he told a crowd at a campaign town hall in Ohio Wednesday.
"I can assure you that even though I have not chosen the person who will be my vice president, that person will be a conservative, they will believe in conservative principles," Romney said in Bowling Green after being told by a questioner he needed to keep "an ear to the tea party" when making important decisions.
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Speculation about who will be chosen as Romney's running mate has ramped up in the past several days as various reports emerge that he may be getting close to an announcement.
At one point in his rally Wednesday, Romney mentioned Florida Sen. Marco Rubio, who some have speculated could be a choice for Romney's running mate. Rubio's name was met with cheers in the audience, with one man in the crowd shouting "Great choice!"
Romney used his town hall on Wednesday to hammer President Barack Obama for a remark, made last week, that business owners rely partly upon the government for their success.
"If you've been successful, you didn't get there on your own," Obama said at a rally in Roanoke, Virginia, on Friday. "There was a great teacher somewhere in your life. Somebody helped to create this unbelievable American system that we have that allowed you to thrive. Somebody invested in roads and bridges. If you've got a business - you didn't build that. Somebody else made that happen."
That remark, which Romney began using on the campaign trail Tuesday, became the centerpiece of his speech Wednesday. At one point in his remarks, Romney asked all business owners in the crowd to stand, thanking them for their hard work and chastising Obama for what he said was "the height of foolishness."
"It's like saying Steve Jobs didn't build Apple. Or Bill Gates didn't build Microsoft. Or that Henry Ford didn't build Ford Motor Company or that Ray Croc didn't build McDonalds or that Papa John didn't build Papa John's Pizza," Romney said.
Romney, citing the number of campaign fund-raisers Obama has held in the past six months, said the president's "priority is not creating jobs for the American people, his priority is trying to keep his own job and that's why he is going to lose it."
At one point during the questions and answer period, a woman asking Romney a question slammed Obama for policies she said were hurting her son's small business.
"He has a string of stores, and because of this awful economy that Obama's created, now he's had to lay off people and he may have to close some stores. And it's all because of what this monster has done to this country. We have to have you as president."
Romney said "monster" was "not the term that I would use," but that the woman "had every right to be angry."
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