Arkansas' attempt to carry out its first execution in nearly 12 years wasn't thwarted by the type of liberal activist judge Republicans regularly bemoan here, but instead by a state Supreme Court that's been the focus of expensive campaigns by conservative groups to reshape the judiciary.

The court voted Wednesday to halt the execution of an inmate facing lethal injection Thursday night, two days after justices stayed the executions of two other inmates. The series of 4-3 decisions blocking the start of what had been an unprecedented plan to execute eight men in 11 days were only the latest in recent years preventing this deeply Republican state from resuming capital punishment.

The possibility that justices could continue sparing the lives of the remaining killers scheduled to die this month has left death penalty supporters including Republican Gov. Asa Hutchinson frustrated and critical of the high court.

"I know the families of the victims are anxious for a clear-cut explanation from the majority as to how they came to this conclusion and how there appears to be no end to the court's review," Hutchinson said in a statement after the Wednesday ruling.

Since the last execution in 2005, the state Supreme Court has at least twice forced Arkansas to rewrite its death penalty law. One of those cases spared Don Davis, who again received a stay Monday night. The legal setbacks at one point prompted the state's previous attorney general, Dustin McDaniel, to declare Arkansas' death penalty system "broken."

But unlike the earlier decisions, this stay came from a court that had shifted to the right in recent elections. Outside groups and the candidates spent more than $1.6 million last year on a pair of high court races that were among the most fiercely fought judicial campaigns in the state's history. Arkansas was among a number of states where conservative groups spent millions on such efforts.