Results from this election will not have an effect on Donald Trumps role as president, but if the Democrats gain control of the House of Representatives then it could block some of his plans for his next two years in office.
Here are the key factors in the battle for political control in Washington and across the country.
Trump's even-keeled talk comes despite a feverish campaign schedule and a second trip to IN in just four days IN an all-out effort to take down Democratic Sen.
The election near the halfway mark of a president's first term is traditionally a referendum on the White House occupant. "When credentials held by women, people of color, or both are dismissed or diminished, it harkens back to centuries of gender and racial discrimination in which individuals of great talent and skill were told that they could not access our nation's most important political, economic, and social opportunities".
Senate Majority Leader Mitch McConnell, R-Ky., and other GOP leaders have also been blaming Social Security and Medicare as sources of the ballooning deficit, suggesting cuts and other reforms could be coming if they hold control.
However, the Democrats are expected to fall short of the two seats they need to win control of the Senate. A conspiracy theory has also been put out that Jewish billionaire George Soros, a philanthropist and Democrat supporter, has facilitated the caravan to arrive in the United States and this theory has not only Trump's stamp of approval, but also widespread acceptance.
While pollsters and analysts have become more cautious in expressing predictions since Trump's shock 2016 election victory, there was a broad consensus that Democrats will probably win the House, but not the Senate.More news: Five Men Arrested Over Bonfire Night Grenfell Tower Effigy Burning
"This election will decide whether we build on the extraordinary prosperity that we have unleashed", says the US President. The president urged supports to "pretend" he was on the ballot.
This spasm of violence fueled a debate about the president's caustic rhetoric, and whether it has played a role in deepening American divisions. As many as 81 per cent of evangelicals voted for Mr Trump in 2016. Trump's response to the court decision was to call Kemp's campaign "extraordinary" and attack his Democrat opponent Stacy Abrams.
"If the radical Democrats take power they will take a wrecking ball to our economy and our future", Trump declared in Cleveland, using the heated rhetoric that has defined much of his presidency.
And they appear particularly motivated to vote.
"There are a lot of people, a lot of people - my opinion, and based on proof - that try and get in illegally and actually vote illegally", Trump said before boarding Air Force One.
Just five years ago, the Republican National Committee (RNC) reported that the party's very survival depends upon attracting more minorities and women.
It may be a logical move.
While recent polls show that healthcare, the economy, and immigration are voters' top concerns, the president admits he has a tough time sticking to the first two.More news: Man fighting for life after shark attack in Whitsundays
Donald Trump has been beating the drum against migrants from Central America.
During the campaign season, Democrats hoped to prompt a "blue wave" and flip several Republican-controlled states.
It is an arresting theme in a country that does not have a universal health coverage system.
"Health care is on the ballot", former President Barack Obama told Democratic volunteers in Virginia.
He also accused Mr Trump of lying and "fear-mongering", warning Democrats not to get distracted.
In the final hours before the election, Mr Trump has criss-crossed the country, pitching for key candidates in critical states such as Florida and Missouri. But farmers themselves have suffered from retaliatory measures imposed by America's trading partners.More news: MTV European Music Awards round up - CBBC Newsround