New York Post claims that Marty hinted that he may run for Mayor:

February 2, 2007 — Brooklyn Borough President Marty Markowitz hinted last night that he might run for mayor in 2009.

"With term limits looming, what about my future?" he asked during his annual State of the Borough speech.

He then answered his own question: "I guess there’s only one way to find out: If it’s good for Brooklyn, it’s good for New York City."