By Alexandra Alper and Jeff Mason WASHINGTON (Reuters) - A political adviser to U.S. Vice President Mike Pence is suspected of sparking an outbreak of the coronavirus on his team that sidelined a senior official days before the presidential election, according to a current White House official and a former official familiar with the matter. Marty Obst, a political strategist for Pence, was determined by contact tracers from the White House Medical Unit to be the likely origin of the outbreak, the two people said. Obst did not immediately reply to a request for comment. Obst, who does not draw a government salary, accompanied Pence to rallies in Bangor, Maine and Harrisburg, Pennsylvania on Monday, Oct. 19, the White House official said. "If you had to pick a patient zero it was Marty and he brought it in from the outside," the White House official said, declining to be named since he was not authorized to speak on the matter. A spokesman for Pence said Marc Short, Pence`s chi...