(Repeats from Friday. Updates chart) ** S&P 500 extends win streak to three weeks, adds 2.2%. Rate-cut euphoria and trade optimism spur index to record highs. Bonds and commodities also catch bids ** Indeed, studies suggested sudden quiet could end with a bang ** And as the SPX went for a second round with resistance , the Dow caught a second wind ** Now the Dow is trying to make the big leap as the SPX notched a "defensive" new high ** Every sector rises: Energy and tech s