Re: 19APR2010 Half-Staff today?
I heard that President Obama said that the flag is to be at half mast until the end of April because of the tornado in Mississippi and the oil rig.
Not exactly. The President has issued two proclamations related to this. The first one, on 12 April, stated the flags should be half-masted at all Government facilities in West Virginia until 18 April in memory of the West Virginia mine workers. This is a bit unusual -- I don't offhand recall another example of a presidental proclamation that limited the half-masting to a particular geographical area.
The second proclamation was issued on 28 April, and declared that day to be "Workers Memorial Day." It mentioned the miners and also the oil rig workers, but did not call for half-masting the flag.
Coincidentally, the flag was half-masted on 29 April for the intermet of civil rights heroine Dorothy Height. That proclamation was issued on 26 April.
The best source for Presidential proclamations is the White House site:
Proclamations | The White House
Peter Ansoff
"We live by symbols, and what shall be symbolized by any image of the sight depends upon the mind of him who sees it."
-- Oliver Wendell Holmes, Jr.