First in line was a retiree, Jerry, who did not want to give his last name and said he was voting for the first time in midterm elections.
The first national elections since Trump captured the White House in a stunning 2016 upset will be a referendum on the polarizing Republican president and his hardline policies, and a test of whether Democrats can turn the energy of the liberal anti-Trump resistance into victories at the ballot box.
In the House, they have around 40 more seats than the Democrats.
"This is a very important election", he added.
USA television networks showed lines of voters at stations elsewhere, following high turnout by those who voted ahead of election day itself. "I'm here to say that hatred is not going to win".
But with turnout a key unknown factor and pollsters still unsure about the effect of Trump's maverick style on voters, both parties admit that they may be in for a surprise.
While the economy continues to thrive, Trump has spent much of the campaign's final days railing against a caravan of Latin American immigrants seeking asylum at the U.S. border.
Democrats are getting some high-profile campaigners to help them, including former President Barack Obama, who rallied voters in his home state of IL.
Heye says the challenge for a lot of Republicans is that what's good for GOP lawmakers on Capitol Hill and what's good for the president aren't necessarily the same thing. "I can't wrap my head around why the other side is so unhappy and so terrified".
On the last day of the campaign, several major television networks - including NBC, CNN and Trump's favourite broadcaster Fox News - announced they had rejected an advertisement from Trump's team that portrayed immigrants as a violent threat to the US.
Should Democrats take the House, they will be able to block party-line legislation and chair several critical committees with appropriations and subpoena power, making it hard for the president to unilaterally decide what priorities to fund, and opening him and his aides to investigation on countless fronts.
Others expressed a heightened sense of unease and sadness about the state of America's political climate.
Georgia - Many will also be watching the race for governor in the southern state of Georgia.
"We've forgotten our decency. We can't have that", he said in an ABC interview. "We're supposed to be a group of people, Americans, who are supposed to be that light in the world".
In suburban Chicago, Lea Grover agreed.
"If trade frictions reduce, that allows the market focus to shift back on strong United States growth; and also ease pressure on global growth and in our view would lead to a stronger eventual rally".
He said those lawmakers could use their committees to investigate everything from potential impeachment of President Trump to Supreme Court Justice Brett Kavanaugh's confirmation testimony to possible Russian collusion. He was accused by a high school classmate of sexually assaulting her decades ago.
Democrats hope to elect a record number of women to congress.
Civil engineer Pritesh Mehta also cast his early vote for those who would support the President. Seven in Ten likely voters said they wanted to send a message to Donald Trump.
Uroosa Jawed is an immigrant, too. Now 42 and a naturalised citizen living in Omaha, Nebraska, she has always considered herself an American.
Editor's note: Men like Trump is a series of dispatches that tell of how a reckless president is steering the White House, and the manner in which his actions are fundamentally altering the office he holds.
However, after an election campaign marred by extremist violence, opponents called the polls a chance to curtail a president they accuse of deliberately stirring racism and social division in the search for votes. "I believe his cover has led to much of the degradation in our political discourse". "But, as you know, my primary focus has been on the Senate, and I think we're doing really well in the Senate".