Democrat Hillary Clinton and Republican Donald Trump attacked one another's character as they pushed their closing arguments six days before the U.S. presidential election, while the latest Reuters/Ipsos poll showed Clinton's lead over Trump rising back to the margin she held last week.
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Many national polls have shown Clinton's lead over Trump narrowing since the re-emergence Friday of a controversy over her use of a private email while secretary of state.
But the latest Reuters/Ipsos daily tracking poll released on Wednesday showed Clinton's lead over Trump rising back up to 6 percentage points, the same advantage she held before the FBI announcement related to her email practices.
Signs of a tightening race have rattled financial markets as investors started to factor in the possibility that the New York businessman might pull off a victory on November 8.
World stocks, the dollar and oil fell on Wednesday, while safe-haven assets such as gold and the Swiss franc rose. Clinton has been regarded as the candidate who would maintain the status quo, an important factor to financial markets, which generally do not like uncertainty.
Campaigning in Orlando, Trump argued that Clinton was unqualified to lead the country and insisted he was winning.
"She has become totally unhinged," he said. "What she's saying and what she's doing, actually, it's unbelievable."
Speaking to supporters in Las Vegas, Clinton blamed Trump for pitting Americans against one another, citing his rhetoric on groups like Muslims and Mexican-Americans. Trump, she said, is "out of his depth," and she called his proposals on foreign policy issues "incredibly dangerous."
"He doesn't have a clue," Clinton said.
Investor anxiety has deepened in recent sessions over a possible Trump victory given uncertainty about his stance on issues including foreign policy, trade relations and immigrants.
Trump, who has never previously run for elected office, has run an unorthodox campaign, with policy proposals including reviewing trade pacts such as the North American Free Trade Agreement and imposing a temporary ban on Muslims seeking to enter the country.
Currency traders have sold the dollar this week in part because they suspect Trump would prefer a weaker dollar given his protectionist stance on international trade, and in part because the uncertainty surrounding a Trump win might lead to a more dovish stance from the Federal Reserve in the months ahead, instead of the interest rate hike that many expect by year-end. A rise in U.S. interest rates would make the dollar, and dollar-denominated assets, more attractive to investors.
A Reuters equity market poll last month showed a majority of forecasters predicted that U.S. stocks would perform better under a Clinton presidency than a Trump administration.
An average of polls compiled by the RealClearPolitics website showed Clinton just 1.7 percent ahead of Trump nationally on Wednesday, with 47 percent support to his 45.3 percent.
Clinton's position is stronger than national polls imply given that the race is decided by the Electoral College system of tallying wins on a state-by-state basis. Winning the presidency requires a majority of 270 electoral votes, and Democrats have a built-in advantage with large states such as California and New York traditionally voting Democratic.
Clinton looked likely to win at least 226 electoral votes, meaning she would need to pick up votes in "toss-up" states such as Florida, North Carolina, Virginia, Ohio, Iowa, Arizona, Colorado and Nevada, according to estimates by RealClearPolitics on Wednesday afternoon.
Trump, on the other hand, has a steeper path to climb, looking likely to win 180 electoral votes, meaning he needs more votes from the battleground states, the website showed.
Both candidates are focusing their final campaign efforts on those crucial states.
Trump and Clinton have campaigned intensively in recent weeks in Florida, which yields a rich haul of 29 electoral votes. A RealClearPolitics average of polls in the state puts Trump 0.7 point ahead of Clinton.
In North Carolina on Wednesday, Clinton deployed President Barack Obama to make the case that Trump posed a unique threat to the future of the country.
"The fate of the republic rests on your shoulders," Obama told supporters in Chapel Hill, calling Trump temperamentally unfit to lead the nation.
Trump's campaign announced plans to run three ads during Wednesday night's Game Seven of the World Series, held in Cleveland, Ohio's second biggest city. The ads focus on the renewed controversy surrounding Clinton's email server.
In an ad titled "Corruption," an announcer says: "Hillary cut deals for donors. Now the FBI has launched a new investigation. After decades of lies and scandal, her corruption is closing in."