Christie has been frequently criticized for having Gibson and Dunn, a law firm who donated to his campaign, investigate the scandal and look into whether he had any prior knowledge of the lane closures. Their findings were attacked by Democrats but now that Barack Obama's own justice department has also found no link between Chris Christie and the GWB lane closures, some of them may have a little egg on their face.
Nevertheless, NJ Democrats have vowed to continue their investigation. This in spite of pleas from Christie to wrap up the investigation. Democrats point out that the federal investigation is still ongoing and have accused Christie of not turning over requested emails and not cooperating with the investigation.
In spite of the fact that that the investigation is still ongoing, for the Feds to announce that they have no evidence on him also means they currently have no leads that are likely to point to him either.