* S&P 500 down 5.1 pct in last six sessions
* Cisco earnings beat expectations, shares jump
* Israeli offensive hits stocks, but lifts energy prices
* Dow down 1.5 pct, S&P 500 off 1.4 pct, Nasdaq off 1.3 pct
By Rodrigo Campos
NEW YORK, Nov 14 (Reuters) - U.S. stocks slid on Wednesday with declines accelerating after President Barack Obama set up a drawn-out fight over the fiscal cliff when he stuck to his pledge to raise taxes on the wealthy, and as violence increased in the Middle East.
Obama, in his first press conference since re-election, held to his position that marginal tax rates will have to rise to tackle the nation's deficits.
With talks over solving the U.S. "fiscal cliff" in early stages, investors are reacting to the uncertainty by shedding positions.
"I think we will have a last-minute cliffhanger solution," said Michael Cheah, portfolio manager at SunAmerica Asset Management in Jersey City, New Jersey, about a deal to avoid the so-called cliff.
"In the meantime, the market is going to get punched every day."
Without a deal, a series of mandated tax hikes and spending cuts will start to take effect early next year that could push the U.S. economy into a recession.
Taxes on capital gains and dividends could rise as part of the negotiations, pushing investors to sell this year and pay lower taxes on their gains.
Adding to the selling pressure, Israel launched a major offensive against Palestinian militants in Gaza, killing the military commander of Hamas in an air strike and threatening an invasion of the enclave. Egypt said it recalled its ambassador from Israel in response.
"We know Europe's in trouble, China's slowing down ... and now you've got the Middle East flaring up again. It's all hitting at once, and obviously, the market is taking a 'sell first, ask questions later' approach," said Ryan Detrick, senior technical strategist at Schaeffer's Investment Research in Cincinnati.
Industrial shares led the decline, dragged lower in part by a 1 percent spike in crude prices after the Israeli offensive on Gaza. The S&P industrial sector index fell 2.5 percent.
Wall Street had opened higher after Dow component Cisco Systems Inc reported first-quarter earnings and revenue late Tuesday that beat expectations, driving its stock up 4.8 percent to $17.66. But the positive momentum was short-lived.
The Dow Jones industrial average fell 185.23 points, or 1.45 percent, to 12,570.95 at the close. The S&P 500 dropped 19.04 points, or 1.39 percent, to 1,355.49. The Nasdaq Composite lost 37.08 points, or 1.29 percent, to 2,846.81.
Both the Dow industrials and the Nasdaq ended at their lowest levels since late June.
The S&P 500 has fallen 5.1 percent in the six sessions since election night. Wednesday marked the benchmark index's lowest close since July 25.
The Russell 2000 tumbled 2 percent. The Dow Jones Transportation average slid 2.6 percent. FedEx Corp shares dropped 3.7 percent to $87.12. Bank of America shares lost 3.6 percent to $8.99.
In contrast, Facebook shares jumped 12.6 percent to $22.36 as investors were relieved that expiring trading restrictions on a huge block of shares did not trigger an immediate wave of insider selling.
Teen clothing retailer Abercrombie & Fitch Co jumped 34.4 percent to $41.92 after the company reported unexpectedly improved third-quarter results and a full-year outlook that exceeded Wall Street's forecasts.
About 7.53 billion shares changed hands on the New York Stock Exchange, the Nasdaq and NYSE MKT, more than the daily average so far this year of about 6.51 billion shares.
On the NYSE, decliners outnumbered advancers by a ratio of almost 9 to 1. On the Nasdaq, about four stocks fell for every one that rose.