CHICAGO — Generations of Chicagoans accustomed to grimy politics might view former Ald. Ed Burke’s federal racketeering conviction last week as just another case in a long conga line of crooked aldermen. But Burke was an undisputed Democratic kingpin. He not only set a record for serving 54 years in the City Council, but he departed in May as the last alderman who rose to power in the era of ...