NEW YORK - (AP) - Will he or won't he? Associates of New York Mayor Michael Bloomberg say he's begun detailed nationwide polling and voter analysis as he considers a third-party run for the White House.

The exhaustive, sophisticated 50-state data collection drive quietly started months ago.

The scope of the research, revealed to The Associated Press, shows how seriously Bloomberg is mulling a run despite almost daily denials.

The man who's done micro-targeting for Bloomberg's two mayoral campaigns says they want "a hard-headed sense of their chances."

There was no comment from Bloomberg's spokesman.