An odd tradition has occurred in both Virginia and New Jersey since 1989, and in Virginia actually going back to 1977.
The party in the White House every time has lost the gubernatorial race in these two states the following year. No one knows why, but since it has happened on a regular basis, it cannot be seen as a bellwether for the future.
There is no way that an election with only two states holding major races can be seen as meaning anything, other than local factors predominating. So the Republicans should be happy, but not get their hopes up for 2010.
It still comes down to this ultimately: As Bill Clinton promoted in his 1992 campaign: It is the economy, stupid!  This is what will decide the fortunes of the Republicans and Democrats in the midterm congressional elections next year!