Joe Biden and Donald Trump are leading a hectic final day of campaigning on the eve of a midterm election that will shape the remainder of the US president’s term – and could pave the way for his predecessor’s comeback to the White House.

Biden’s Democrats face a gargantuan battle to stay in Congress after a race the president has described as a “defining” moment for U.S. democracy — although issues like inflation have largely dominated the campaign.

Republicans are in a comfortable position to win a majority in the House of Representatives on Tuesday, and many Democrats fear the Senate, too, could slip away in a defeat that would leave Biden’s enemies nearly dead in his last two years in the White House would take full responsibility for the legislation.

Polls show most Americans are concerned about the economy and feel the country is on the wrong track, encouraging Republican candidates in districts that once seemed out of reach.

With all 435 House seats up for grabs alongside a third of the 100-seat Senate and a number of state posts, Democrats put a brave face on their prospects.

“The White House party usually loses during the midterm elections, but the reality is we still have a very strong path of not just keeping the Senate, but actually winning seats,” New Jersey’s Cory Booker told Sunday ABC.

Democratic candidates were campaigned for star power by the party’s most popular senior statesmen, including former Presidents Barack Obama and Bill Clinton.

Republicans have tapped into a shortlist of their own political big hitters, with the campaign spotlight in recent weeks turning to Trump – who teased a likely new presidential nomination in 2024.

Biden and Trump will go head-to-head on election night: the president at a rally near the capital in Maryland while Trump competes in a tumultuous Senate race in Ohio.

The political landscape has tilted away from Democrats since the summer, with polls showing Republicans have a chance of a double-digit majority in the House of Representatives.

“This will be a wake-up call for President Biden,” was Glenn Youngkin, Virginia’s Republican governor, upbeat over the weekend.

The Senate is more of a toss-up, but Democrats’ hopes of retaining the upper chamber, which they control thanks to Vice President Kamala Harris’ tied votes, hang in the balance.

Races in Pennsylvania, Nevada, Wisconsin, Georgia, New Hampshire and Ohio have narrowed to projected photo finishes, and any one of them could shift the balance of power.

Democrats have focused their closing arguments on voting rights, protecting abortion access and welfare — and, in Biden’s case, the threat posed by growing support for political conspiracy theories among Trump’s Republicans.

Republicans counter that an election will not mean an end to soaring inflation and rising violent crime for the Democrats, and are trying to turn the midterm elections into a referendum on the president.

With his approval rating hovering around 42 percent, Biden has largely avoided the most contentious states.

But he rallied alongside his former boss Obama in Pennsylvania on Saturday, as part of a hectic late-stop agenda that has also taken him to Illinois, Florida and New York.

The President rebuked extremist supporters of “defeated President” Trump, telling the crowd, “Your right to vote is on the ballot.” Your right to vote is on the ballot.”

At a rival weekend rally in the swing state, Trump – who continues to make false claims that the 2020 election was stolen – accused the “radical, insane” Democrats of creating “America’s demise and demise.”

The US President has announced major achievements, including curbing prescription drug prices, ramping up microchip manufacturing and record investment in infrastructure.

Democrats are struggling to turn those legislative victories into enthusiasm in the US heartland.

But Amy Klobuchar, a 2016 presidential hopeful, pushed back Sunday because Democrats lost the messaging war and predicted a good night for her party.

48 percent of likely voters said they prefer a Democratic-controlled Congress, while 47 percent want Republicans in power, in the campaign’s latest national NBC News poll.

But 80 percent of Republican-leaning voters say they will certainly vote or have already voted, six points above the number of Democrats, according to a new Washington Post-ABC News poll.

Turnout forecasters are always keeping a close eye on Election Day weather, which appears to be warmer-than-average in most parts of the country.

According to the United States Elections Project, about 40 million Americans had voted early as of Sunday afternoon, just surpassing the 2018 number.