NEW : Obama says saying that he is engaging in nefarious tactics is ` ` hard to believe '' and lashes out at Democratic rival over ` ` blatantly false '' campaign promises . Health care , NAFTA positions misrepresented , she says in response . Polls show Clinton and Obama are in statistical dead heats in delegate-rich Ohio and Texas , which both hold votes March 4 . Obama also says mailers are accurate .
NEW : Obama says saying that he is engaging in nefarious tactics is ` ` hard to believe '' and lashes out at Democratic rival over ` ` blatantly false '' campaign promises . Health care , NAFTA positions misrepresented , she says in response . Obama also says mailers are accurate .