Suppose that President Obama had a press conference where he announced that he had found a quarter. Once the press corps realized that he was not joking and that this was actually the point of his press conference, they would immediately rush out pieces about how the president was off his rocker.
Well President Obama has not, thus far, had a press conference on the topic, but a "senior administration official" reportedly touted an agreement with China to buy $45 billion in U.S. exports. The Post article provided no information about the time period over which these goods would be purchased (e.g. 2 years? 10 years?), nor is there any reason to believe that the deal actually involves new exports. (One of the items in the Post article is planes being sold by Boeing, the sale of which had already been announced.)
While $45 billion may sound like a big commitment, senior administration officials know that it is not. The United States had a trade deficit with China of more than $250 billion over the first 11 months of 2010. Exports of $45 billion over some indefinite number of future years, many of which were already in the pipeline, will not affect this in any noticeable way.
In other words, it's great that President Obama found a quarter, but he should not be wasting the public's time by telling us about his good luck. The media should be ridiculing him for implying that this is an economically meaningful event.