Mid-week market update: I continue to believe that the stock market is vulnerable to a setback. It's not just the negative RSI divergence, which is concerning, it's the inability for breadth to broaden out that's worrisome. As the accompanying chart shows, the equal-weighted S&P 500 to S&P 500 ratio stalled out at a relative resistance zone, and the Russell 2000 to S&P 500 has been in a relative downtrend. Where's the leadership that could lead stocks higher?