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
Why did Michael Bloomberg pen an op-ed officially endorsing Barack Obama for president?
Michael Bloomberg cited Obama's policies on climate change.

Question: What was the speculation?
Self-contained rewrite: What was the speculation aboutMichael Bloomberg in 2012?