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. With US Election a Week Away, Trump and Biden Campaign in Contested States Ken Bredemeier WASHINGTON - With one week until Election Day, Republican U.S. President Donald Trump and his Democratic challenger, former Vice President Joe Biden, headed Tuesday to political battleground states in a frantic push to shore up critical support to win a four-year term in the White House. Their travel plans reflect the state of the race, with polls showing Biden ahead of Trump by seven to nine percentage points nationally and about half that in contested states that are likely to determine the overall outcome. On Tuesday, Trump is on defense, headed to three midwestern states he won in his upset victory over Democrat Hillary Clinton in 2016 -- Michigan, Wisconsin and Nebraska -- and likely needs to capture again to win a second term. But polls show him trailing in Michigan and Wisconsin and, while he is ahead statewide in reliably Republican Nebraska, he trails in the race to win a single elector in an Omaha-based congressional district that could play a role in deciding next week's national winner. Meanwhile, the seemingly confident Biden is on offense, headed to two stops in the southern state of Georgia, which has not backed a Democrat for president since 1992. Pollsters show Biden and Trump locked in a tossup to win the state's 16 Electoral College votes. Typically, all of a state's Electoral College votes go to the candidate who receives the most popular votes in that state. Both Trump and Biden are looking to piece together state-by-state victories to get to a majority of 270 in the 538-member Electoral College, where the most populous states hold the most sway. Trump lost the national popular vote four years ago and is likely to again this time, but he retains a chance to win the presidency a second time in the Electoral College if he can claim wins in key battleground states he is visiting in the final days of the contentious campaign. Four years ago, Trump narrowly won three northern states -- Pennsylvania, Michigan and Wisconsin -- that traditionally have voted for Democrats. He likely needs to capture at least Pennsylvania and its 20 electoral votes, along with holding other key states he won in 2016, in order to remain the U.S. leader. .