Pennsylvania Gov. Tom Corbett (R). (AP) Pennsylvania Gov. Tom Corbett (R). (AP)

The poll numbers of Pennsylvania Gov. Tom Corbett (R) continue to erode, according to a new survey from Franklin and Marshall College.

The pollster's latest numbers show 69 percent of Pennsylvanians think it's time for a new governor, while just 20 percent say he deserves another term. Three months ago, 25 percent said he deserved another term.

Just 17 percent of voters think Corbett is doing an "excellent" or "good" job -- a new low for his tenure -- while 76 percent say he's done a "fair" (43 percent) or "poor" (33 percent) job.

Even among Republicans, just 30 percent say he's doing an "excellent" or "good" job, while 63 percent say "fair" or "poor."

Corbett, who has struggled to pass his top legislative priorities, is set to face the winner of a Democratic primary that includes Rep. Allyson Schwartz and state Treasurer Rob McCord, among others.

The Fix last month labeled Corbett the most vulnerable governor up for reelection in 2014.