Washington: Republican John McCain has intensified character attacks on Democratic opponent Barack Obama, who is climbing in the polls as voters' preferred candidate to handle a deepening financial crisis and plunging stock market.

The US economy has been the consuming voter issue for months, but anxiety has grown as home values plummet, retirement savings vanish and unemployment grows. On Thursday, the Dow Jones Industrial Average plunged to its lowest level in just over five years - falling more than 7 per cent.

Diverting comments

McCain is seen as struggling on economic issues since the administration of fellow Republican George W. Bush first confronted the financial crisis and asked Congress to pass a $700 billion (Dh2.57 trillion) rescue plan.

Last weekend, McCain's running mate Alaska Governor Sarah Palin charged that Obama sees the US differently than most Americans and had been "palling around with terrorists," a reference to William Ayers, a founder of the violent Vietnam-era group the Weather Underground.

In his own strongest criticism of Obama, McCain told a Wisconsin crowd on Thursday: "We need to know the full extent of the relationship" with Ayers. Loud cheers from the 4,000-strong crowd near Milwaukee greeted McCain's attacks.

McCain told supporters that Obama had not been truthful in describing his relationship with Ayers, and added that Obama himself has "a clear radical, far-left pro-abortion record".