IOWA -- It has all-the-makings of a historic night for Democrats and Republicans in Iowa in what remains a very close race on both sides. The Iowa caucuses officially kickoff the 2016 presidential election season.After months of campaigning and more than $200 million spent on advertising, the race for supremacy in Iowa is close in both parties. Among Republicans, Donald Trump appears to hold a slim edge over Ted Cruz, a fiery senator from Texas. Hillary Clinton and Bernie Sanders entered Monday in a surprisingly tight Democratic race, reviving memories of the former secretary of state's disappointing showing in Iowa eight years ago.You can watch more ABC News live streams from Iowa at abcnews.com/live