Last month, Daniel Donovan, the district attorney for Staten Island, New York, announced that a grand jury had not charged the New York City police officer whose apparent chokehold killed Eric Garner — despite a graphic video of the encounter showing the unarmed man's last gasping breaths. For many prosecutors, that result might not seem like much of an achievement. But it hasn’t held Donovan back. Last week, he announced he’d run as a Republican for the U.S. congressional seat left open when Michael Grimm stepped down after pleading guilty to felony tax fraud. On Monday, Donovan’s only major rival for the party’s nomination, Assemblywoman Nicole Malliotakis, bowed out, clearing the field for the district attorney. The general election hasn’t yet been scheduled but is expected to take place this spring.