For example, today Fitch Ratings released a report addressing whether eminent domain restrictions currently under consideration in many legislatures will hurt municipal credit. Their view is that it may very well, but more so over the long-term than in the immediate future.
Here's an excerpt from the report:
"By impairing a state or local government's efforts toward economic development, such legislation, if enacted, may limit opportunities for credit quality improvement and rating upgrades. Moreover, Fitch believes that restrictive legislation has the potential to contribute to a diminution of credit quality over a longer term, in that the proposed laws limit a state or local government's ability to respond to economic blight or weakened conditions. In the near term, however, Fitch does not expect rating downgrades as a result of legislation restricting the use of eminent domain in most situations."
