Mark A. Darr (born July 3, 1973) is the former 15th Lieutenant Governor of Arkansas. A member of the Republican Party, he was elected to succeed Democrat Bill Halter in 2010, having defeated Democratic challenger State Senator and former House Speaker Shane Broadway by a margin of 51 to 49 percent.Under sanction for ethics violations involving illegal use of campaign funds, Darr resigned as Lieutenant Governor on February 1, 2014.