Obama digs up past McCain scandal
US Democratic presidential candidate Barack Obama has attacked John McCain's links to a 1980s financial scandal.
He also accused his Republican rival of being more focused on running a smear campaign than on fixing the US economy.
It comes after Mr McCain's running mate Sarah Palin accused Mr Obama over the weekend of associating with terrorists.
Mr Obama once served on a charity board with an ex-member of US-based militant group Weather Underground, Bill Ayers, now a University of Illinois professor.
He has denounced Mr Ayers' radical past.
Mr McCain spent the weekend in Arizona preparing for Tuesday's presidential debate but Mrs Palin, governor of Alaska, held several rallies.
She told supporters in Colorado and California that the time had come to take "the gloves off" - suggesting that Mr Obama's character may be the subject of further attacks.