The presidential race entered a critical three-day period in September when the economic crisis cast the candidates' differences in sharp relief.

On Sept. 24, with financial markets verging on panic and the economy thudding, Democratic Sen. Barack Obama placed a call to rival John McCain. He wanted to suggest they issue a joint statement on proposed financial-bailout legislation. As hours went by without a return call, Obama aides emailed each other, asking, "Have you heard anything?" One answered: "The McCain camp is cooking...