I don't think Reagan did, personally. But I do think high treason was committed by members of his administration. The question remains: Did Reagan know it? Or did he delegate too much authority to too many?
Discomfiting ... Absolutely! But the poll doesn't ask about the administration, or define specifics. Personally, I think the buck stops with the President. In investigations, things don't always evolve that way. I think Reagan probably, due to age, delegated too much. He may have even made a remark that got the idea rolling(as when Congress wouldn't back funding to rebels). But the Iran-Contra investigation, by a bi-partisan committee, found Reagan personally free of wrong-doing. The guilt was placed on others, within his administration. That might have been convenient, or factual. Who knows?