Allende won the Presidency with 36% of the vote in a three horse race.
I'm not sure what this tells us about Nixons right to have Allende deposed though.
I will, however, say that Allende is oft depicted by the left as some universally beloved leader that only the aristocracy despised. I have not heard this from my (many) Chilean friends (and they aren't part of that aristocracy). Also, it is hard to overthrow a leader when they actually are universally beloved. It happens because the people let it.