"These midterms are incredibly significant because Donald Trump is the most polarising president in the U.S. and these midterms will decide whether or not there is a check to the Trump presidency, or whether Trump will proclaim himself vindicated and proceed unchecked for two years", says Professor Allan Lichtman from the American University in Washington DC.
Obama also appeared later on Sunday in his old home state of IL, which hosts a competitive governor's race and several tight U.S. House of Representative races. If Democrats win the House, Trump will have a ready-made foil for his 2020 re-election campaign, even if his Democratic opponent is not such a lightning rod. The last batch of states will close their polls at 1 a.m. EST on Wednesday night.
Donald Trump has been beating the drum against migrants from Central America.
At a rally in West Virginia Friday a defiant Trump brushed off the prospect of a Democratic House takeover.
In Georgia, Democrat Stacy Abrams would become the first black woman to be elected governor in USA history if she defeats Republican Brian Kemp. It can be considered an invasion.
In an interview with ABC on Monday, the president said he wished he had had "a much softer tone" throughout his presidency. And there are reports since that besides the United States army, several militia groups are headed to defend the border.
Given Trump's stunning victory in 2016, few were confident in their predictions. "The prospect of a Democratic controlled House or Senate puts a serious wrinkle in getting anything through Congress".
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"When you vote, Illinois, you can reject that kind of politics". Eighteen percent of those polled were still undecided.
Support for the Republicans remains reliant on Mr Trump's core base - older, conservative, largely rural blue-collar white men and women.
Americans would elect 435 members of the House of Representatives and 35 of the 100 Senate seats, 36 governors' posts and seats in state legislatures across the country in the mid-term polls.
Pollsters are pegging the Democrats as most likely to take control of the House of Representatives, but the Senate is a much bigger ask.
President Trump and congressional GOP leaders will see holding the House as validation of their approach to governing. The contest to succeed retiring California Republican Darell Issa is likely going to Democrat Mike Levin, and in Washington state's 8th district, Democrat Kim Schrier's chance of replacing retiring Republican Dave Reichert has moved from "Toss Up" to "Lean Democratic". Five of those seven seats were also held by Republicans.
However, the Democrats are expected to fall short of the two seats they need to win control of the Senate.
During his final campaign rallies in Ohio, Indiana and Missouri, Mr Trump returned to his key campaigning issues, including insisting that Democrats would damage the economy and allow more illegal immigration. As many as 81 per cent of evangelicals voted for Mr Trump in 2016.
'I don't care. They can do whatever they want and I can do whatever I want, ' he responded. Democrat Stacey Abrams is running against Republican Brian Kemp.
In Florida, Democratic Tallahassee Mayor Andrew Gillum is looking to become the Sunshine State's first black governor while current Gov. Rick Scott looks to beat Democratic Sen. "If he gets in, Georgia goes forward". Democrats were still ahead in the polls going into today's vote, but the gap had narrowed in recent days.