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The last presidential election in the US had both OECD and OAS observers. See http://www.businessinsider.com/international-observers-at-us-presidential-voting
by bzbarsky 9y ago
The last presidential election in the US had both OECD and OAS observers. See http://www.businessinsider.com/international-observers-at-us-presidential-voting-rigged-elections-2016-10 http://www.businessinsider.com/international-observers-at-us... for example.
According to that article, there have been OECD observers since 2002, though not many.