another major change in the president's economic team. christina romer, she's head of the economic -- the council of economic advisors and she's stepping down. announcing she's leaving the white house in early september. now, romer has long indicated her time in washington would probably be temporary. she's widely respected among her administration colleagues although there were some reports about tensions between her and larry summers, the president's economic advisor. according to jonathan alter in his book "the promise" the two got into a shouting match on one occasion when she felt she was being excluded from an important meeting. she co-wrote a paper that predicted the stimulus package would prevent unemployment from rising above 8%. a prediction that turned out to be wrong and come under attack from the president's republican opponents and she supported a larger stimulus package than the president ultimately backed but white house officials say her departure is not due to any personality conflicts or policy differences. this comes a week after