A consortium of influential space organizations has issued a white paper to the presidential candidates explaining their view on how to ensure United States leadership in space.The white paper, signed by the Aerospace Industries Association (AIA), AIAA, the Commercial Spaceflight Federation, and the Space Foundation, among others, lists key issues the consortium believes threaten U.S. leadership in space: budget uncertainty, international competition, the space operating environment and workforce trends. Space Foundation CEO Elliot Pulham told reporters Friday that the white paper…