Romney responded with his own harsh criticism, attacking Obama as anti-private sector for saying: "If you've got a business, you didn't build that. Somebody else made that happen." The Romney campaign used the phrase in an ad last week.
Friday's shooting also put fresh focus on the issue of gun control, which has played virtually no role in a race focused on the economy.
Last year, following the killing of six people and wounding of then-Rep. Gabrielle Giffords in Tucson, Ariz., Obama called for a series of steps to "keep those irresponsible, law-breaking few from getting their hands on a gun in the first place." But Psaki, his campaign spokeswoman, said it was "too early to say" whether the president would propose any new gun control policies following the Colorado shootings.
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