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. Competitive, Expensive US Political Primary Races to be Decided Tuesday VOA News 24 August 2010 U.S. Senator John McCain, R-AZ., and his wife, Cindy McCain, pose for a photo with firefighters at Phoenix Firestation # 1 in Phoenix, 21 Aug 2010 Photo: AP U.S. Senator John McCain, R-AZ., and his wife, Cindy McCain, pose for a photo with firefighters at Phoenix Firestation # 1 in Phoenix, 21 Aug 2010 Voters are going to the polls in five U.S. states to determine candidates for the general election in November. In the southwestern state of Arizona, veteran U.S. Senator John McCain is expected to easily defeat former U.S. Representative J.D. Hayworth in a Republican Party primary. Recent public opinion polls indicate that McCain, his party's 2008 presidential candidate, holds a double-digit lead over his challenger. McCain has spent $20 million on the campaign, compared to about $3 million for Hayworth. In the southeastern state of Florida, voters will choose a Democratic candidate for the U.S. Senate in another closely watched race. U.S. Representative Kendrick Meek is facing billionaire real estate investor Jeff Greene, who spent millions of his own money on the race. The winner will face Republican candidate Marco Rubio and current Governor Charlie Crist, who is running as an independent. In the far northwestern state of Alaska, former Governor Sarah Palin is endorsing candidate Joe Miller as he tries to defeat Republican U.S. Senator Lisa Murkowski. And in the northeastern state of Vermont, five Democrats are vying for the chance to become the party's nominee for governor. The winner of that race will face off against Republican Lieutenant Governor Brian Dubie in November. In the south-central state of Oklahoma, two U.S. House Republican nominations will be decided in a runoff from an earlier primary. The entire House of Representatives and one-third of the U.S. Senate are up for election in November. The general election is considered to be a referendum on U.S. President Barack Obama's first two years in office. Some information for this report was provided by AP. .