A three-judge panel of the Colorado Court of Appeals ruled unanimously, on May 10th, that Day of Prayer proclamations by the Governor are unconstitutional. The court didn’t address the National Day of Prayer but the reasoning can be applied to that law: “A reasonable observer would conclude that these proclamations send the message that those who pray are favored members of Colorado’s political community, and that those who do not pray do not enjoy that favored status.”
The case was brought by the Freedom From Religion Foundation in 2008: