US President Barack Obama speaks about the importance of American workers developing American-made energy to an economy that?s built to last at the UPS in Las Vegas, Nevada, on January 26, 2012. Obama denied Republican claims he was waging class warfare as he set out to sell his call for tax hikes on the rich in states crucial to his reelection bid. AFP Photo/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)