Confidence shot. Tempers up. Patience spent. This economy has Americans feeling cooked. It had been one bummer of a summer, conservatives and liberals agreed, even before the news late Friday that Standard & Poor’s reduced the nation’s top credit rating from AAA to AA-plus. The previous day, after a federal debt deal averted government default, the European credit crisis and fears of a double-dip U.S. recession crashed the Dow anyway — erasing all gains of 2011.