Nader ≠ nadir.
Nader- Ralph Nader, an American politician who has run unsuccessfully for POTUS several times, first as a Green party candidate and then as an Independent, primarily known for acting as a spoiler in the 2000 election.
nadir- the lowest point in the fortunes of a person or organization; the opposite of “zenith.”
I think that I have actually heard people use the word “nadir” in my life, but just assumed they were making a reference to Ralph Nader. My mind is blown.