Remind me again, how many billions has Obama lost on the “green energy” businesses he invested our money in? Yeah, I think we’ll take Mitt.

President Obama celebrated the role Iowa played in his campaign in 2008 and took aim once again at Mitt Romney’s business background at a campaign rally on the Iowa State Fairgrounds on Thursday.

“The last time he visited these same fairgrounds, he famously declared that corporations are people,” Obama told a crowd of roughly 2,500 packed into an exhibit space. “Human beings, my friends.”

The president maintained that the private equity industry is a welcome part of the economy — risk-takers and investors should be rewarded, he said. But their motives are not job creation.

“The people who work in these firms will tell you that’s not their goal,” Obama said, explaining that the goal for private equity companies, such as Bain, the company Romney co-founded, is “maximizing short-term gains for your investors.”