On an unusually warm January weekend, Iowa politics is heating up, with a new poll in the state's largest newspaper showing Bernie Sanders and Hillary Clinton neck and neck heading into Monday's presidential nominating caucus.

Advertisement Bernie Sanders barnstorms Iowa in search of caucus upset Final Des Moines Register poll shows Clinton 3 points ahead Share Shares Copy Link Copy

On an unusually warm January weekend, Iowa politics is heating up.WPTZ NewsChannel 5's Stewart Ledbetter is in Des Moines, Iowa, covering Sen. Bernie Sanders' campaign and his final push before Monday's caucus.Voters are seeing results from the final poll published by the Des Moines Register which shows Sanders three percentage points behind Hillary Clinton among likely Democratic party caucus-goers. That is well within the margin of error.Watch this storyThe same poll found Republican Donald Trump has regained the lead among likely caucus voters, with a five point lead over Texas Sen. Ted Cruz.Sanders was working hard to pull off an upset over Clinton, once the prohibitive favorite. The senator was continuing his bus tour of mid-sized Iowa towns, trying to woo new voters and pump up a small army of volunteers who are doing door-to-door to persuade Iowa voters to turn out for Sanders Monday night.Sanders continued to draw large crowds where he repeats his message that Wall Street has become far too powerful, effectively controlling Congress and "rigging the economy" against the average American.In Waverly, speaking to an enthusiastic crowd, Sanders predicted victory -- if turnout is high.”If we can get working class people who do not always go to caucus… if we can get young people to get involved in the political process, we will win. If the voter turnout is low, we will be struggling and we might not win," Sanders said.In 2008, when then-Sen. Barack Obama pulled off an upset over Clinton, about 240,000 Iowans took part in the Democratic caucus, a record turnout.In this state of 3 million residents, Sanders is hoping for something close to the Obama turnout this time. About 120,000 Republicans participated in the 2008 caucus.Sanders will be a guest on several network political shows Sunday, including "Meet The Press" on NBC, and then resume his bus tour with a series of stops planned. He will end the day with an election eve rally at Grand View University in Des Moines. Also Saturday, the senator's spokesman, Michael Briggs, declined to confirm a report published by CNN Saturday that Sanders has requested Secret Service protection. Sanders would be the fourth candidate to receive such a detail, CNN said. Secret Service agents already protect Clinton, Trump and Ben Carson, the network said.