Connecticut's Sen. Christopher J. Dodd has accomplished the improbable: Despite several months on the campaign trail, he has yet to boost his standing among Democratic presidential candidates into single digits. Nationally, he polls within the margin of error, making it statistically possible that nobody supports his bid. In his latest attempt to distinguish himself, Sen. Dodd last week proposed steps that he said are vital to reduce pollution and limit global warming. He called for increasing fuel-economy standards to 50 mpg over the next 10 years and creating a corporate carbon tax that would make businesses pay a per-ton fee...