Top politicians in Romania’s ruling Social Democrats (PSD) have called on the party leader to step down over criminal corruption convictions and party-related violations.
I cannot find an English transcript of the letter, but one of the many reasons behind asking him to step down was that he has a much lower popularity than party popularity.
I have also heard political analysts arguing that a high discrepancy between leader popularity (significantly lower) and party popularity is a strong reason for the leader to step down (the expression used is that the leader should be like a locomotive for the party, not the other way around) either nicely or by force.
I am wondering if such reasoning is used in Western democracies.
Question: Is a low popularity of a political party leader typically used as a reason for asking to resign?