A Republican, Parker won a special election in 2012 to replace retiring senator Merle Flowers in District 19 after defeating Rep. Pat Nelson.[2][3] The district included parts of DeSoto County and was the most populous district in the state.[3][4] Legislative redistricting created a new district in DeSoto county, resulting in Parker to run in District 2 for the Mississippi State Senate in 2015.[4] He won the election.[1] In 2019, his seat was considered "Safe Republican" by the Mississippi Center for Public Policy.[5]
He voted to defund Common Core in 2014 on an amendment, which ultimately failed.[6] In the aftermath of the Charleston church shooting in June 2015, Parker calledfor the Confederate battle flag to be removed from the flag of Mississippi, suggesting it was divisive.[7] He was part of the legislative redistricting committee in the senate in 2021.[8] He authored a proposal to reinstate the ballot initiative in the state.[9]