The new survey of the New Jersey gubernatorial race from Public Policy Polling (D) finds Republican nominee Chris Christie, a former U.S. Attorney, leading Democratic Gov. Jon Corzine by 50%-36%.

This is even a bit better for Christie than a month ago, when he led 51%-41%.

The internals show Corzine only leading 64%-20% among Democrats in this heavily blue state, with Christie up 86%-6% among Republicans and 54%-26% among independents.

"A visit from Barack Obama and negative ads against Chris Christie haven't gotten Jon Corzine any momentum so far," said PPP president Dean Debnam, in the polling memo. "The key to his chances of getting reelected is going to be moving that 64% of the Democratic vote he's earning right now closer to the 90% mark."