Mitt Romney twice cited the National Federation for Independent Businesses and President Barack Obama referred to AARP two times during the debate.
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Romney invoked the NFIB as he criticized the president over tax rates.
"And your plan is to take the tax rate on successful small businesses from 35 percent to 40 percent. The National Federation of Independent Businesses has said that will cost 700,000 jobs," Romney said.
Obama cited the AARP when he defended his health care plan.
"AARP thinks that the -- the savings that we obtained from Medicare bolster the system, lengthen the Medicare trust fund by eight years," he said.
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AARP, which is nonpartisan and doesn't back candidates, responded after the debate with a statement saying that the country needs to hear more than rhetoric on Social Security and Medicare.
"We're grateful that this evening the candidates engaged in a more robust conversation with regard to Medicare. We're also pleased Social Security was included in tonight's debate. But America's voters deserve more than talking points and 30-second sound bites," the group said.
The AFL-CIO, which backs Obama, tweeted throughout the debate, taking pointed shots at Romney.
Romney is just making up stuff at a faster rate than we can possibly factcheck.-- AFL-CIO (@AFLCIO) October 4, 2012
The National Association of Manufactures President and CEO Jay Timmons released a statement after the debate that praised Romney.
"Governor Romney laid out a strong jobs program built on the fundamental principles of a pro-growth agenda," Timmons said.
But the award for most concise tweet used to illustrate a lobby's point probably goes to the American Coalition for Clean Coal Electricity, tweeting under the handle @AmericasPower.