And just look at how wide the playing field is - Democrats need to pick up 23 seats to take back the House, and they are targeting some 80 Republican-held seats. Bob Corker (R-TN), who opted to not seek reelection.
"They want to impose socialism on our country". I don't care what they say.
For example, how can Democrats assemble a winning coalition in 2020 if they fail to appeal to the moderate suburban voters who hold sway in the congressional districts that decide which party holds a House majority? Of that, 4.1 million are Democrats, nearly 3.3 million are Republicans and 1.2 million are independent or registered with a third-party.
IL doesn't have a U.S. Senate race this year, but nearby states do.
The two parties were also tangling in several crucial governors' races, including in Midwest battleground states such as Wisconsin, Ohio, Iowa and MI. For many American progressives, anxiety is rampant that talk of a Democratic victory will collapse into some bad new reality by night's end.
A Democratic House victory would also serve as a warning to Republican officeholders about their policies, their devotion to the president, and the brand of campaigning they have chosen this time.
"You gotta get to the polls on Tuesday, and you gotta vote", Trump implored a crowd in Macon, Georgia, where he campaigned for the Republican gubernatorial candidate in one of the country's tightest major races.
Immigration is a key issue in the upcoming USA midterm elections.
Laying into the tangled legal scandals enveloping the Trump administration - especially the possible collusion between his presidential campaign and Russian operatives - Obama scoffed, "They've racked up enough indictments to fill a football team". "You vote, you might save a life". Meanwhile, some Democrats are openly running as socialists, and others, according to recent hidden-camera investigations, are concealing their far-left views to win votes.
A sharply divided USA electorate heads to the polls Tuesday to elect a new Congress and to render a midterm verdict on President Donald Trump.
A slightly longer answer notes that we can point to certain factors likely to be significant on election day that are encouraging for Democrats. "There is a lot of energy out there". White people and Hispanics, Republicans, suburbanites, men, the elderly, the college educated, and supporters of President Trump were the most likely to say they have faith in democracy now. For one thing, the United States economy is experiencing an unprecedented upswing.
On the flip side, if Republicans maintain control of the House and Senate, that's not only a victory for the GOP, but a validation of Trump's brand of politics and his unconventional presidency.
A pre-midterms Ipsos poll for the Daily Beast found that "investigating and potentially impeaching" Mr Trump was the number one priority for self-identified Democratic voters.
A week ago, Democrats held a 47% to 44% lead.
"High turnout should be good for Democrats but Republicans are also coming out in big numbers", he said. "But, as you know, my primary focus has been on the Senate, and I think we're doing really well in the Senate".
A fanatical Trump supporter was also arrested on charges of mailing pipe bombs to prominent opponents of the president, including Obama.
Republicans, trying to move past that, have been enthusiastically pressing the economic argument. In the seven weeks before Tuesday's elections, Trump averaged 30 false or misleading claims a day, up from an average of five a day during his first nine months in office.
I understand many of us are disappointed that Republicans didn't do more, that many people don't like the president's tweets, etc.
But on the eve of the election, in a packed airport hangar in Cleveland and at other Trump rallies across the nation, the stakes are different: a vote to protect a leader they see as under siege, whose inflammatory rhetoric is a necessary price for a norm-shattering era of change.
Former President Barack Obama has been campaigning with Democratic candidate for Georgia Governor Stacey Abrams.
"There's got to be consequences when people don't tell the truth, when words stop meaning anything".
"We'll just have to work a little bit differently", he told reporters without elaborating on those different tactics.
But Republicans who have been down this road before offer words of caution - be careful what you wish for.