Krugman is a reverse indicator. Everything he says is the opposite of true. He is infallible in that way.
Lincoln also spoke from a window of the WH (the balcony was not yet built)
Lincoln stood at the window over the building's main north door, a place where presidents customarily gave speeches. Brooks held a light so Lincoln could read his speech, while young Tad Lincoln grasped the pages as they fluttered to his feet. The speech introduced the complex topic of reconstruction, especially as it related to the state of Louisiana. For the first time in a public setting, Lincoln expressed his support for black suffrage. This statement incensed John Wilkes Booth, a member of the audience, who vowed, "That is the last speech he will make." A white supremacist and Confederate activist, Booth made good on his threat three days later.
http://www.abrahamlincolnonline.org/lincoln/speeches/last.htm