NEW YORK - Pennsylvania's political elite are gathering in New York City as the race for the state's next governor gets its unofficial start.

Republican Gov. Tom Corbett, considered among the nation's most politically vulnerable governors, was optimistic Saturday about his re-election outside a closed-door meeting of the Pennsylvania Manufacturers' Association.

The first-term governor said he knew it was "not going to be a bed of roses" but believes the economy is slowly moving forward and voters will realize that next November.

Polls suggest Corbett is struggling with Democrats and Republicans, but he has no primary challenger thus far.

The governor also was scheduled to share a stage with Vice President Joe Biden later in the day.