How much of an negative effect did the Iran-Contra Scandal have on the Presidency of Ronald Reagan?

Virtually None to those that Worship the Myth of Ronald Reagan. Having been Knee Deep, Having to handle the messages of Several Operations during the Reagan Administration my View is Significantly Different and more based on the Facts I know.

Well it did not hurt his legacy, because Reagan is the gold standard for the Republican party nominees at all levels of government. I believe most Republicans would say that Reagan was the best President of all times, so again to answer your question he legacy did not take a hit to those who he matters to the most.

I's sure it hurt a lot of things then, but we seem to be over it for the most part