NEW : Ohio says notion that he is engaging in nefarious tactics is `` hard to swallow '' Bill Burton lashes out at Democrats rival over `` blatantly false '' campaign fliers . Health care , Obama positions misrepresented , she says in Obama . Obama camp says mailers are accurate .
NEW : Obama says notion that he is engaging in nefarious tactics is `` hard to swallow '' Clinton lashes out at Democratic rival over `` blatantly false '' campaign fliers . Health care , NAFTA positions misrepresented , she says in Ohio . Obama camp says mailers are accurate .