In 1952 President Truman established one day a year as a "National Day of Prayer." Truman believed the Bible.
In 1988, President Reagan designated the first Thursday in May as the National Day of Prayer. Reagan believed in the Son of God.
In June 2007, Presidential candidate Barack Obama declared that the USA was no longer a Christian nation. What does Obama believe?
In April 2009 President Obama canceled the National Day of Prayer at the White House. He didn't want to offend anyone, especially not Muslims.
This year, Obama will issue another flat proclamation on May 6th – as he did last year. It will probably contain all the neo-liberal clap trap we've come to expect. Or it may tilt to Islam more explicitly. He hasn't joined a church but he has been seen in the US and in Europe worshiping with Muslims.
His campaign slogan was change and we Americans have been served a great deal of change, but this change is marked by a huge discrepancy between this President and his predecessors. And his color isn't the issue! Had Obama been a social conservative he would have had my vote in a heartbeat. It was time for America to have a black (or multi-racial) President. But it is never time for change that erodes the moral fiber of a nation. It is never time for undoing what is good about America.
The President is correct in stating that America is not "Christian", but in reality no nation has ever been truly Christian - that is persuaded to the last person that Jesus Christ is the Son of God who came into the world to save sinners (such as me). Still, that's not a reason to eliminate a Day of Prayer. It is in fact, a greater reason to stress prayer.
For the record, on September 25, 2009, a National Day of Prayer for Muslims was held on Capitol Hill, beside the White House. There were about 50,000 Muslims, mostly men, in the US capital that day. ( http://www.islamoncapitolhill.com/)