ABC News has learned that David Bonior, the campaign manager for the 2008 presidential race of Sen. John Edwards, D-NC, will endorse Sen. Barack Obama, D-Illinois, today.
Bonior, a former Michigan congressman, was once the second highest ranking Democrat in the House, and is influential with labor unions.
Tuesday night's results were said to be key to Bonior's decision -- specifically the fact that Obama's lead over Sen. Hillary Clinton, D-NY, appears insurmountable.
Bonior is also said to like Obama's general positive tone, as well as Obama's message of change and stance against taking money from federal lobbyists.
Edwards has not yet endorsed either candidate.