noun
political life; political career
Refers to a politician's career or viability, often used in contexts of survival, continuation, or end of one's political existence.
そのスキャンダルで彼の政治生命は終わった。
The scandal ended his political career.
次の選挙が彼の政治生命を左右する。
The next election will determine his political future.
More explicitly refers to a politician's career, while 政治生命 can also refer to the life of a political entity or movement.
Compound of 政治 (politics) and 生命 (life). The exact historical derivation is uncertain, but the term is conventionally used to describe a politician's career or the viability of a political entity.