US stocks traded mostly lower Monday on the eve of the presidential vote, with President Barack Obama and Republican challenger Mitt Romney locked neck-and-neck in the race for the White House.
After an hour of trade, the Nasdaq remained the only gainer, resting barely above breakeven.
The Dow Jones Industrial Average was down 37.45 points (0.29 percent) at 13,055.71 by 1430 GMT.
The broad-based S&P 500 fell 4.27 (0.30 percent) to 1,409.93, while the Nasdaq Composite edged up 0.18 (0.01 percent) to 2,982.30.
The bearish market sentiment came "with tomorrow's US presidential election draining conviction on the Street, along with festering Greek bailout uncertainty," Charles Schwab & Co. analysts said.
A key reading on activity in the massive US services sector slightly disappointed.
The Institute for Supply Management reported its purchasing managers index for the nonmanufacturing sector dropped to 54.2 percent in October from 55.1 in September. Most analysts had forecast a decline to 54.5 percent.
Caterpillar rose 0.6 percent in the aftermath of superstorm Sandy that battered New York and New Jersey a week ago, leaving huge needs for reconstruction of homes and infrastructure.
Insurers were under pressure. Dow member Travelers Companies fell 1.3 percent.
Among stocks in focus, Humana dropped 1.4 percent after reported third-quarter earnings above expectations and raised its full-year profit estimate. The health care company also announced it would acquire Metropolitan Health Networks, up 2.3 percent.
Supporting the Nasdaq was Apple, up 1.4 percent after announcing Monday it had sold three million iPads in the first three days of its launch of the iPad mini and the fourth-generation model of its original format iPad.
Bond prices rose. The 10-year US Treasury yield fell to 1.68 percent from 1.71 percent late Friday, and the 30-year dropped to 2.87 percent from 2.90 percent. Prices and yields move inversely.