Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. 6 Democratic Presidential Candidates Trade Barbs, Attack Trump Ken Bredemeier WASHINGTON - Six U.S. Democratic presidential candidates traded barbs with each other in a tense debate late Tuesday, attempting to make the case to voters in the farm state of Iowa that they alone have the political fortitude and skill to take on Republican President Donald Trump in the November national election. With heightened world tensions between the U.S. and Iran, Sen. Bernie Sanders of Vermont, a self-described democratic socialist, quickly attacked the foreign policy credentials of the party's national front-runner for the presidential nomination, former Vice President Joe Biden. Sanders derided Biden's 2002 vote authorizing the U.S. invasion of Iraq on what proved to be erroneous American intelligence that deposed dictator Saddam Hussein was amassing weapons of mass destruction, while Sanders opposed the the 2003 invasion. He said Biden voted for the "worst foreign policy blunder in the history of this country." Biden, who for years has said his Iraq vote was a mistake, countered that while he had erred, as former U.S. President Barack Obama's second in command, he worked to bring home more than 150,000 U.S. troops once stationed in Iraq and to end the conflict. .