Maybe.
Guess where the Japan downgrade occurred in this chart.
And for you idiots who actually think that a potential downgrade has anything to do with our debt/deficits, there's this, which sums it up nicely:
Not to mention that the agencies have essentially been wrong/late to the party on everything. They also don't have any insight into the credit quality of the US that investors can't figure out themselves.
It's all politics at the agencies and a desperate attempt to be relevant again after being the major contributor to the '08 financial crises and the run-up to it.
And for some perspective:
Carry on.