Paterson's campaign kickoff is scheduled Saturday morning at Hofstra University, where he attended law school.
He has stops later Saturday in Rochester and on Sunday in western New York, becoming the first Democrat in the race, but probably not the last.
Political pundits are predicting Attorney General Andrew Cuomo, the son of former Gov. Mario Cuomo, will challenge Paterson in a Democratic primary. Cuomo has remained mum about his future, but has raised more than $16 million compared to Paterson's $3 million.