[BRIEFING.COM] The major averages continue to chart session lows at midday.
The consumer staples sector (+0.4%) is one of just three S&P 500 sectors that trade higher. Casey's General (CASY 844.47, +42.48, +5.30%) leads the advance, while the sector's largest component, Walmart (WMT 113.40, +1.86, +1.67%) , adds to yesterday's gain that came after the company announced rollbacks across thousands of "summer" items.