Marine Le Pen?
And Sanders is decent by every country's standards. If i were American i'd definitely pick him.
Marine Le Pen is batshit crazy, but I don't know if she ever said that a vast majority of all immigrants are criminals. I mean, she's definitely racist and all, but I doubt she'd get away with such a blatant disregard for statistics. For me Trump's craziness is unmatched in Europe, and until recently he'd have been mocked in the US as well (cfr. Bush who was way more 'normal').
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Trouble is he's proven to be more of a single-issue guy with little expertise nor care for the broader demands of the presidency.
He's also 74. In a lot of countries there is a tendency towards younger people, e.g. Matteo Renzi, Charles Michel, Mark Rutte, ... People in their forties with established careers, but who still have a lot to do. Sanders would be 78 when his term ends and to really amount to something, you need two. At the halfway point of his second term he'd be 80..
I don't want to discriminate against age at all and there are plenty of 80 year olds who are still bright, but is it really fair to place such a burden on him?