Conversation so far:
What was Michael Bloomberg doing in 2012?
Michael Bloomberg declined to seek office, opting to continue serving as the mayor of New York City.
What happened in 2012 with Michael Bloomberg after he declined to seek office, opting to continue serving as the mayor of New York City?
In the immediate aftermath of Hurricane Sandy in November 2012, Michael Bloomberg penned an op-ed officially endorsing Barack Obama for president

Question: Why did he do this?
Self-contained rewrite: Why did Michael Bloomberg pen an op-ed officially endorsing Barack Obama for president?