I find it quite odd that none of the Republican presidential candidates ever mention the name George W. Bush. If they thought he was a successful president, it seems they would be bringing him up all the time. The fact that they never do must mean that they think he was a failed president.
If they consider him a failed president, then I find it even more odd that all of them want to expand his policies.
If his tax cuts for the rich didn't stimulate the economy, then the obvious answer is more tax cuts for the rich. If not enforcing environmental laws and banking regulations didn't encourage business to hire more workers, then certainly repealing all those laws he didn't enforce will do the trick.
Their logic escapes me.