Rates inched lower Tuesday, largely reflecting yesterday’s late rally in mortgage-backed securities. In economic news, the July S&P/Case-Shiller 20-city home price index rose 0.6%, a bit less than forecast, and was 12.4% higher than one year ago. Consumer Confidence fell to 79.7, close to expectations. Results from today’s 2-year Treasury auction will be released at 1:00 PM.