Vice President Joe Biden made a surprise visit to Washington, D.C.’s Naval Observatory on Saturday for a confidential talk with Sen. Elizabeth Warren (D-Mass.), CNN reported. Biden’s return to the District comes amid buzz he is seriously weighing a 2016 Oval Office bid. CNN said that two sources confirmed the pair’s face-to-face, the biggest indicator yet that Biden is seriously tempted by an Oval Office bid next year.“The vice president traveled last minute to Washington, D.C. for a private meeting and will be returning to Delaware,” an aide told CNN. Biden spokeswoman Kendra Barkoff declined further comment on the alleged...