Sen. Obama receives endorsement of former Clinton official Robert Reich . The Associated Press contributed to this report. Obama responded to the endorsements in a statement , saying the two `` will be important sources of advice and counsel for our campaign in the months ahead . '' ` My conscience wo n't let me be silent any longer '' Ex-Sens . Sam Nunn and David Boren also endorse the Illinois senator . Clinton lashes out at Obama ; McCain campaign calls Obama `` recklessly dishonest ''
Sen. Obama receives endorsement of former Clinton official Robert Reich . The Associated Press contributed to this report. ` My conscience wo n't let me be silent any longer '' Ex-Sens . Sam Nunn and David Boren also endorse the Illinois senator . Clinton lashes out at Obama ; McCain campaign calls Obama `` recklessly dishonest ''