WASHINGTON (MarketWatch) — There’s no way to sugarcoat it: The already-sluggish U.S. economy is stalling out, stung by doubts about our economic and fiscal future. The Institute for Supply Management reported that its manufacturing index dropped to 49.7% in June from 53.5% in May, signaling that the manufacturing sector is contracting for the first time since mid-2009. Read our complete news coverage of manufacturing activity shrinking in June. Both the ISM headline index and the ISM new orders index plunged below 50% in June. By itself, the decline in the ISM index below the benchmark 50% level does not mean...