A worker cleans up oil in Mayflower, Ark., on Monday, April 1, 2013, days after a pipeline ruptured and spewed oil over lawns and roadways. (AP Photo/Jeannie Nuss) As oil companies boast the safety of the proposed Keystone pipeline, more than 22 Arkansas homes have been ordered to evacuate a Friday ExxonMobil oil spill, caused […]