When it rains, it pours. First came Sandy, the incarnation of the Rumsfeldian “unknown unknowns.” Then came the political hurricane, with three-term New York City Mayor Michael Bloomberg endorsing Barack Obama for his second.

Bloomberg’s endorsement is unusual for a number of reasons, not least because the famously tri-partisan mayor eschewed an endorsement four years ago, has slapped the president’s wrist in the past, and all but snubbed him when Obama offered to tour the devastation in New York City, leaving the president to embrace New Jersey Governor Chris Christie, one of Mitt Romney’s most outspoken surrogates.

Here’s the kicker: Bloomberg titled his endorsement, published in his eponymous news outlet, “A Vote for a President to Lead on Climate Change.”

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One possible indication of where we are heading: The same day as the mayor’s endorsement, Bloomberg’s BusinessWeek put Sandy on its cover, under the headline: “It’s Global Warming, Stupid.”

It is.

Read the “[...]” middle at foreignpolicy.com.