Since President Obama has cancelled the White House's involvement in the National Day of Prayer one has to ask what the purpose of the NDP is.
For millenia national leaders have declared a day of fasting and prayer to show humility and reverence in times of stress and trouble. It is curious that the President, who "prays everyday" according to White House insiders, would not see value in leading the nation in that reverential humility. Especially so, with the violent storms that have ravaged the land, the terror threats and attempted bombing in Times Square, and the economic hardship that currently rocks the nation. We are left to assume that the controversy that might ensue from a nation unifying to pray is being avoided.
Nevertheless, we in the church must pray. We are commanded in 1 Tim 2.1-2 to pray for "for all men, for kings, and for all who are in authority". Of course, that should be more frequent that the first Thursday in May. (I pray for those in authority on Wednesdays, btw). We citizens, regardless of creed or religion, should set aside time to beseech God for blessing on our country. This is no vague patriotism. It is a recognition that mankind, and the US in particular, needs divine help.
We Christians need to pray, especially today, for God's blessing on America. Not that we may be blessed more than other countries (though we already are) but that we show God our recognition of our own desperation and a thankful heart for all that has come our way.
"if my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then will I hear from heaven and will forgive their sin and will heal their land." 2 Chron 7.14