LITTLE ROCK - Arkansas Lt. Gov. Bill Halter issued a statement Saturday endorsing Barack Obama for the Democratic presidential nomination, but the political endorsement was e-mailed from a government computer at his state office. Arkansas law prohibits the use of government resources for political purposes. When asked about the e-mail, Halter spokesman Garry Hoffmann said it was his idea and his mistake. "I guess I should have sent it from my home computer. I just wasn't thinking," Hoffmann said. "If that's a screw up, sorry. I'm kind of new at this." Hoffmann, who has worked for Halter since December,...