At least, not all-important.
Who remembers the mayor of Paris during the Lost Generation of the 1920's, at which in that town congregated a host of great writers like Pound, Stein, Joyce, Hemingway?
Who remembers the mayor of San Francisco during the Beat movement there in the late 1950's? The city, if anything, was hostile to writers like Rexroth and Bob Kaufman. But what do we remember now from that place and time?
Writers and artists make a city-- not mayors.