Stocks are at their lowest level since July (SPY, SPX, DJI, IXIC)

Stocks were lower in trading on Tuesday, and the S&P 500 declined to its lowest level since July.
October was the worst month for the market since January, and the S&P 500 trimmed its year-to-date gain to 3% from about 6%. An uneven start to the third-quarter earnings season rocked the share prices of some big companies on the major indexes that reported last month.
Next Tuesday's presidential election also looms, though many investors are not making big trading decisions ahead of the vo