Ken Bennett, Arizona’s secretary of state, threatened to keep President Obama off the ballot this fall unless it was proved that Obama’s birth certificate is not a fraud. In response, an online petition was begun, garnering 18,000 signatures, requesting that Bennett certify that Mitt Romney, the Republican nominee, is not a unicorn. Bennett called the probe ridiculous, but he also withdrew his threat to take Obama off the ballot. In March, a California group filed a suit that would require all presidential candidates to certify their citizenship. In addition to raising the usual—and long since disproved—claim that Obama was not born in the U.S., the suit raised questions about Romney’s birth certificate, since his father had spent some time as a child in Mexico (Washington Post, May 29).