* U.S. stocks jump on light buying, Dow up 1 pct
* U.S. election keeps markets subdued
* Euro steady after hitting two-month low before Greece votes
* Gold poised for biggest one-day rise since September
NEW YORK, Nov 6 (Reuters) - Wall Street stocks jumped on Tuesday as American voters went to the polls, with the U.S. presidential election keeping trade subdued while the euro held steady despite uncertainty over Greece's next financial aid payment.
Polls indicated President Barack Obama and Republican challenger Mitt Romney remained in a neck-and-neck race, although the Democratic incumbent had a slight edge in several key swing states.
The general view on Wall Street is that a Romney win would favor stocks due to the perception his policies are pro-business, while another Obama term would favor bonds due to views his policies would keep interest rates low.
Analysts downplayed the stock market's advance as traders' betting on a Romney victory.
"There's been a lot of talk that once the election is decided, no matter how it went, just to have the uncertainty over would be good for the market," said Rick Meckler, president of hedge fund LibertyView Capital Management LLC in Jersey City, New Jersey.
Traders seemed more concerned over how the election results will affect the U.S. government's handling of the "fiscal cliff," the $600 billion in automatic tax hikes and spending cuts set to kick in on Jan. 1 unless Congress takes action.
Economists have said the spending cuts and tax hikes could ignite a new recession in the world's biggest economy, while Europe continued to struggle with a prolonged debt crisis that has hurt regional growth.
There is no clear consensus in financial markets on whether Obama or Romney could reach a timely deal with leaders of the opposing party to avoid the fiscal cliff.
"We do know this much," said Peter Kenny, managing director at Knight Capital in Jersey City, New Jersey. "Though the resident in the White House may change, the face of Washington is still going to be one of tremendous gridlock, discord and dysfunction, and markets are going to force Washington to come to terms with the dysfunction."
The winner will also decide who will head the Federal Reserve. There has been speculation Chairman Ben Bernanke, whose term expires in January 2014, might not want to serve another term. Romney has said he will not reappoint Bernanke.
"If Obama wins, we would be certain Ben Bernanke would remain in office as Federal Reserve chairman at least until his normal term expires," said Peter Fertig, a consultant with Quantitative Commodity Research in London.
On below-average volume, the Dow Jones industrial average closed up 133.24 points, or 1.02 percent, at 13,245.68. The Standard & Poor's 500 Index ended up 11.13 points, or 0.79 percent, at 1,428.39. The Nasdaq Composite Index finished up 12.27 points, or 0.41 percent, at 3,011.93.
Energy and defense stocks led the market advance, along with materials and industrial shares, as a Romney victory could benefit these sectors.
For example, United Technologies rose 2.7 percent to $79.97, while Exxon Mobil gained 1.1 percent at $91.61.
Among the day's losers, Express Scripts Holding Co plunged 12.3 percent to $55.15 and was the biggest drag on the Nasdaq after the pharmacy benefits manager said analysts' forecasts for its 2013 results were too aggressive, casting doubt on how well it is integrating its $29 billion purchase of Medco Health Solutions Inc.
Top European shares closed 0.56 percent higher, rebounding from Monday's losses, boosted by strength in the technology and travel and leisure sectors.
Hannover Re, the world's third-biggest reinsurer, ended up 4.5 percent at 55.90 euros after its quarterly profit beat forecasts and it lifted its expectations for 2012 and 2013.
World stocks on the MSCI global index ended 0.62 percent higher after back-to-back losing sessions.
Developments in Greece were also keenly followed. The Greek parliament will vote o n W ednesday on 13.5 billion euros of fresh spending cuts and tax hikes that are crucial to unlocking 31.5 billion euros in aid. There will be a follow-up vote on Sun day on an austerity budget for 2013.
"Suffice to say if the vote fails, the euro will drop and the dollar will rally, but even if the vote passes, any rally in the euro will be short-lived," said Neil Mellor, currency strategist at Bank of New York Mellon in London.
The euro recovered against the dollar at $1.2813, little changed on the day, after the single currency fell to a two-month low at $1.2764.
The dollar retreated from a two-month high against a basket of major currencies. The dollar index slipped 0.18 percent at 80.611.
In the bond market, U.S. Treasuries prices and German government debt fell, reversing Monday's safe-haven gains tied to uncertainty about the U.S. election.
Benchmark 10-year Treasury notes were down 21/32 in price to yield 1.752 percent, up 7 basis points from Monday. German Bund futures were down 38 basis points at 141.75.
In commodity markets, Brent crude oil settled up $3.34 at $111.07 a barrel and U.S. oil futures jumped $3.06 at $88.71, tracking gains in equities markets.
Gold posted its biggest one-day gain since mid-September, rebounding from a nine-week low set o n M onday. Bullion was up 1.9 percent at $1,715.34 an ounce.