But almost 40 percent of voters could still change their minds.

Support for Democratic presidential primary candidate Bernie Sanders seems to be surging following a Jan. 14 debate in Iowa.

The changes are designed to make the caucus system more transparent and to make sure that even the lowest-performing candidates get credit for all the votes they receive.

Asked about his son and Ukraine, Joe Biden grew angry and insulting toward a potential voter in Iowa as he called him a 'damn liar' and 'fat.'

When told who the former vice president was, he told a reporter, ‘Ohhhhh. I’m not an Obama fan. This is Republican country.’

Biden’s last presidential run ended in Iowa back in 2008, with a one percent finish in a caucus contest won by an Illinois senator named Barack Obama.

By at least one measure, President Donald Trump is looking pretty good in Iowa as he heads toward his 2020 re-election bid.

The Iowa caucuses, scheduled for Feb. 3, 2020, is going to bring out the best and worst in the Democratic presidential candidates -- and it will be the end for many.

Seventy-six-year-old Joe Biden, who hasn't even announced he's running for president next year, is currently the cream of Iowa's crop among Democratic hopefuls.

This probably isn't going to win her any new fans.