While many support the choice of the states and the execution of violent criminals, there is a shift in favor of abolishing capital punishment in recent years. This is particularly true for various conservative groups, who view it as murder and share concerns about costs and the number of innocents sent to death row. source

Since about 2016, Democrats have increasingly opposed the death penalty because it’s morally seen as murder, and new technology has proven various people on death row were unjustly convicted. The party favors improving rehabilitation measures and CSI technology. source