SPRINGFIELD — Leaders of the state-run Abraham Lincoln Presidential Library and Museum testified before the Illinois House Tourism Committee Tuesday, asking for help paying off millions of dollars in debt used to purchase artifacts.Without financial help from the state, the organization may be faced with selling prized Lincoln artifacts, its leaders told lawmakers.The group took out a $23 million loan in 2007 for the artifacts. So far, it has paid $13 million toward principal and another $8 million in interest.If the …