PARIS  - US White House hopeful Barack Obama said Friday that Iran should not wait for the new US president to be elected to resolve its dispute with the West over its nuclear programme. "Iran should accept the proposals that President (Nicolas) Sarkozy and the EU... are presenting now. Don't wait for the next president," he said at a joint Press conference with Sarkozy in Paris. Obama pointed out that he was still merely a presidential hopeful.  "Just let me remind everybody that I'm not the president. I am a United States senator, I am a candidate for president," he said. He received a rock star welcome from 200,000 cheering fans for a speech he made Thursday in Berlin calling for the world to tear down walls of division and hate. Meanwhile, the road ahead to the White House is long for Democrat Barack Obama despite a rock star reception overseas, with polls in key states showing a tight race against Republican John McCain. As the Illinois senator gave a crowd-rousing performance before 200,000 people in Berlin, polls released in the United States showed waning enthusiasm for the man who would become the first African-American US president. Obama maintains a lead over his 71-year-old rival - between one and six points according to pollsters - but his edge is beginning to recede, despite what McCain's camp has described as the media's "love affair" with Obama. An NBC News/Wall Street Journal poll published Wednesday showed 55 per cent of US voters considered Obama the riskiest choice for US president, while just 35 per cent said the same of McCain. "Well, I do understand it," Obama said in an interview with NBC news. "I'm new to the scene. John McCain's been around 25, 30 years in public life. I have just recently emerged in terms of our national politics. And so it's not surprising that people would say that," Obama said. The same poll found that 58pc of voters identified more closely with McCain's values and background, while 47pc said the name of Obama. A separate study published Thursday by Quinnipiac University showed McCain had gained ground in several key battleground states, and surpassed the Democrat in Colorado. The survey showed McCain was close on Obama's heels in Michigan and Minnesota, and other polls have shown McCain ahead in some key states usually considered Democratic bastions, such as New Hampshire. Given those odds, Obama's camp considers it crucial that he win other key states such as Ohio, Pennsylvania, Nevada and New Mexico. McCain's main supporters are white males and people over 65, groups that are likely to show strong turnouts at the polls. Some experts say McCain's down-home approach, which he worked on this week while visiting working-class voters and grocery stores in Pennsylvania and Ohio, seems to be bearing fruit, especially among American voters whose main concern is the economy, not the war in Iraq. "With voters saying that the energy issue is now more important to their presidential vote than is the war in Iraq, this group represents an opportunity for the Republicans," said Peter Brown, assistant director of the Quinnipiac University Polling Institute. The Arizona senator has said he supports offshore drilling for oil, like President George W. Bush in order to meet the United States' increasing energy needs. Obama opposes this, in favour of developing renewables such as solar and wind. A Fox news poll Thursday showed that 71pc of respondents are in favour of offshore drilling. "The fact that Obama is out of touch with voters ... is certainly something we'll continue to reiterate," said Alex Conant, spokesman for the Republican National Committee. "To the extent that he's acting as if he's already president when the election is over 100 days away and everyone expects it will be a very close race raises questions about how in touch he is." Obama returns to the United States on Saturday evening.