As Republicans search for someone to succeed John Boehner as speaker of the House, some have suggested bringing in an outsider, such as former House speaker Newt Gingrich or Colin Powell, the former secretary of state and onetime chairman of the Joint Chiefs of Staff.But does the speaker have to be a member of the House?The Constitution is silent on that question, saying simply, "The House of Representatives shall chuse (sic) their Speaker and other Officers."The Clerk of the House agrees with the office of the House Historian, which says the speaker "has always been (but is not required to...