During the 2008 campaign, questions about John McCain's birth in the Panama Canal Zone on a U.S. military base prompted some to ask whether McCain was eligible to be president, since the Constitution stipulates that anyone not born in the United States is not eligible to be president. Amid a flurry of news reports, McCain's own campaign announced in February 2008 that it was conducting an investigation. When a bipartisan pair of lawyers announced the following month that McCain was indeed eligible, the issue virtually died--apart from a Senate resolution that pretty much laid the question to rest by attesting...