LAS VEGAS, NV – JANUARY 26: U.S. President Barack Obama (L) is introduced by United Parcel Service (UPS) truck driver Joe Mueller at a UPS freight facility January 26, 2012 in Las Vegas, Nevada. Obama, who is on a three-day trip to five states following his State of the Union speech, spoke about greater use of natural gas and the U.S. economy. (Photo by Ethan Miller/Getty Images)