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Clinton appears in a new ad for the Obama campaign, telling viewers the President's plan for investment in education and job training will strengthen the middle class and move the economy forward.

"The Republican plan is to cut more taxes on upper-income people and go back to deregulation," Clinton says in the ad. "That's what got us in trouble in the first place."

Clinton is scheduled to deliver a major speech at next month's Democratic convention.

Meanwhile, First Lady Michelle Obama visited the Sikh temple in Wisconsin Thursday where a gunman killed six people earlier this month.

On the Republican campaign trail, Mitt Romney laid out his energy policy in New Mexico- as he looks to refocus his campaign.

In recent days, Missouri Republican Senate nominee Todd Akin's comments on and rape and abortion have commanded national attention and sidetracked the Romney campaign.

Speaking to voters in New Mexico, Romney called for boosting U.S. energy production. He said increased energy independence will lead to more jobs and greater national security.

"We have to have a national security strategy which takes into account the fact that America will be stronger if we have all the energy we need to power our economy and power our military," he said. "This is not just a matter of economy and jobs and rising incomes and a growing economy and more tax revenues. It is also more security."

Meanwhile, Vice Presidential candidate Paul Ryan held a roundtable event in Fayetteville, North Carolina on Thursday, where he pledged to never lower defense spending.