WASHINGTON (MarketWatch) — The $800 billion federal stimulus bill has boosted employment by 1 million to 2.1 million and helped the economy grow about 1.5% to 3.5% larger than it would have without the stimulus, the nonpartisan Congressional Budget Office said Tuesday. Those estimates are in line with the CBO’s previous estimates, and those of other economists who’ve looked at the economic impact of the American Recovery and Reinvestment Act, which was passed about one year ago.