Harrisburg (Pennsylvania, US), Oct. 22 : Republican running mates John McCain and Sarah Palin have once again questioned Barack Obama''s readiness to lead the country in the wake of the latter’s running mate Joe Biden saying that Obama would face a "generated crisis."

"We don''t want a president who invites testing from the world at a time when our economy is in crisis and Americans are already fighting in two wars," McCain said Tuesday in Harrisburg, Pennyslyvania.

"Thanks for the warning, Joe," Palin said to cheers from about 2,500 supporters at the Reno-Sparks Convention Center in Nevada.

Biden made the comments over the weekend to two fundraising audiences in Seattle, saying he expected world figures to test Obama early if he wins the election in two weeks.

"Mark my words. It will not be six months before the world tests Barack Obama like they did John Kennedy. The world is looking," Biden said.

"Watch, we''re gonna have an international crisis, a generated crisis, to test the mettle of this guy."

The McCain campaign jumped on the remarks.

McCain on Tuesday, in response to Biden''s reference to President Kennedy, recalled being ready to launch a bombing run during the October 1962 Cuban Missile Crisis.

As the crowd of several thousand began to swell with cheers and applause, he added: "America will not have a president who needs to be tested. I''ve been tested, my friends."

Democratic aides said that Biden was merely reciting history and assuring supporters that Obama is the man for the job.

But Palin on Tuesday linked Biden''s comments to Obama''s foreign policy positions.

The latest Gallup tracking poll Tuesday showed Obama still leading nationally by as much as 10 percentage points among likely voters. (ANI)