US Senator Elizabeth Warren has been a liberal favourite since her election in 2012. An outspoken critic of big business and a proponent of more regulation on the banking industry, the Massachusetts Democrat earlier this month led an effort to stop the $1.1tn government funding bill because it included changes to the 2010 Dodd-Frank law that imposed strict rules on Wall Street. Now Warren’s liberal supporters are touting her as a viable alternative to former Secretary of State and presumed Democratic frontrunner Hillary Rodham Clinton for president in 2016. The left-liberal website MoveOn.org recently launched a campaign to draft Warren...