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Barack Obama and Mitt Romney are spending the weekend hammering out their foreign policy battle lines ahead of their final debate, dropping off the campaign trail and dispatching their running mates to court voters in battleground states.

The debate, which focuses on international affairs, will be the final chance for each to lay out his policy platforms and engage in verbal jousting in front of tens of millions of TV viewers just 15 days before voters head to the polls.

With both sides conceding that the race to Nov 6 will go down to the wire, and amid a consensus that each candidate won one of the previous two debates, the stakes for Monday's clash are enormous.

And just as they study up on the particulars of US policy on the Middle East, China and Russia, the New York Times reported a possible breakthrough on talks with Iran - a report quickly squelched by the White House.

Citing unnamed administration officials, the Times reported that Iranian officials had agreed to direct US-Iran talks over Teheran's nuclear program, after years of secret talks between the two sides.

The White House swiftly denied any deal had been reached, saying it was still working on a "diplomatic solution".

"It's not true that the United States and Iran have agreed to one-on-one talks or any meeting after the American elections," National Security Council spokesman Tommy Vietor said in a statement.

The Times story broke just as the two US candidates were hunkered down for debate prep.

Obama was gathering his team at Camp David, the remote presidential retreat in Maryland's Catoctin Mountains, while Romney opted for a bit of sun, heading to a beach-side resort in Florida, where he is huddling with top strategists.

The challenger also took the opportunity to hit up wealthy donors one last time. Romney attended his final fundraising event of the campaign on Saturday in Palm Beach, an aide said.

With the candidates off the trail, it was up to their deputies to sway voters.

Vice-President Joe Biden was in Orlando, Florida, where he ducked into a campaign field office to energize volunteers before heading to an event in St. Augustine.

"We wanted to come to the epicenter of the epicenter," Biden said, mindful that the Orlando-Tampa corridor is the most vital region of the largest swing state of all.

The Republican ticket is placing a similar premium on the Sunshine State. Romney and running mate Paul Ryan shared the stage on Friday at a rally in Daytona Beach.

Then Ryan went on a multi-state tour on Saturday, from key battleground Florida to Pennsylvania - a state that had been seen as a sure bet for Obama but where Romney has made recent inroads - then Ohio and finally on to Nebraska.

Ryan, chairman of the House Budget Committee and creator of a controversial budget plan that envisions dramatic cuts to federal spending, told a crowd in Pennsylvania's Moon Township that the US could no longer endure an outsized government.

"Mitt Romney and I believe we need to limit government so our economy can grow,” Ryan said.

Obama has caught flak from Republicans - as well as from Democrats driven to near-panic over the president's polls slide in recent weeks - for not articulating a clear vision for the next four years.

For their part, Obama supporters attack Romney for not revealing details of which loopholes or deductions he would close or end in order to pay for his planned 20 percent tax cut.

Just over two weeks remain and polls show the candidates neck and neck, with battlegrounds Florida, Ohio and Virginia proving crucial.

Obama won all three in 2008, but as a measure of the tightness of this year's contest, they are all up for grabs, with Florida leaning toward Romney, Virginia a tie, and Ohio leaning toward Obama, according to widely read poll averages by Real Clear Politics.

（中國日報(bào)網(wǎng)英語點(diǎn)津 Helen 編輯）

About the broadcaster:

Emily Cheng is an editor at China Daily. She was born in Sydney, Australia and graduated from the University of Sydney with a degree in Media, English Literature and Politics. She has worked in the media industry since starting university and this is the third time she has settled abroad - she interned with a magazine in Hong Kong 2007 and studied at the University of Leeds in 2009.