Since his first days as a presidential candidate, Barack Obama has championed investment in infrastructure. Now would seem a good time to do some. America has high unemployment and an unbalanced economy. Meanwhile, the downsides of oil dependence are painfully clear in the slick that is growing in the Gulf of Mexico. Mr Obama's stimulus programme included nearly $30 billion for road- and bridge-building and an $8 billion commitment to high-speed rail. But little has been done.
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