I'm not sure about this particular thing, but I've seen some stories about McDonnell and his wife getting, well let's just say they have a very cozy relationship with certain monied interests. Now there's this:
Donor bought Rolex watch for Virginia Gov. McDonnell, people familiar with gift say
In addition his wife had a cushy paid position as an "advisor" to a charity sponsored by a coal company. I don't know if anyone cares about that kind of thing, but the "gift" of a $6,500 might be considered taxable income? IANAL so I'm not sure about that but if there's "an ongoing federal investigation" it means the potential for some criminal charges to result. I think it's a potential problem for him unless the investigation ends with no charges filed. Even then, it looks bad.