A party boss — no recommendation at all.

The runoff battle between Lightfoot and Preckwinkle promises to be a donnybrook, pitting a new reformer against an old one who has since become a party boss. Whatever happens, assuming the two indeed face each other in a runoff, Chicago will make history with its first African-American woman as mayor. [emphasis added]

Makes it an easy choice when you say it (credibly) that way.