Character attacks emerge in McCain-Obama race
Debate stakes higher for McCain as insults mount
McCain calls Obama a liar
Obama: McCain tries to turn attention from economy
Palin criticizes Obama's ties to Wright, Ayers
McCain, Obama camps trade barbs on negative ads
Analysis: Palin's words may backfire on McCain
Quotes from Palin on Obama's ties to Wright, Ayers
Palin ethics probes beset by secrecy and lawsuit