Who's undecided? Donald Trump's toughest hurdle to pull off a win: Most minds are made up

Few Americans say they are undecided about who they will vote for this election, posing a problem for Presidential Donald Trump as early turnout soars.

WASHINGTON — Trying to claw back into the lead in the race for president with time running out, Donald Trump is so aware of the voters he needs – the ones he's struggling to win back – that he's calling them out by name.

As Trump's support erodes among voters ages 65 and older, women, and suburban voters, Democratic nominee Joe Biden has taken a double-digit lead in several national polls and widened margins in battleground states. .

But Trump faces a problem unlike four years ago: The vast majority of voters – 95% or higher in most polls – say they have already decided who they're backing and can't be persuaded.

"I think it's vitally important that the current president move out of the White House and on to his business practices," said Bob Lowe, a 72-year-old retired superintendent from Le Center, Minn., who has already voted for Biden after backing libertarian candidate Gary Johnson in 2016.

With fewer undecided voters in this year's election and not as many considering voting for a third-party candidate, Biden has eclipsed an important mark. He is consistently polling with support from more than 50% of voters, while Clinton typically polled in the high- or even mid-40s in October before the 2016 election.

And Biden, lacking the high negative marks that Clinton did, has turned into an elusive target for the Trump campaign.

An NPR/Maristy University Poll released Thursday found Biden ahead of Trump 54%-43% among likely voters. Only 2% said they are unsure who they will vote for and just 1% said they are backing a third-party candidate.

More: The week in polls: Biden hits double-digit lead in national average, surges in Florida, Michigan.

In the Real Clear Politics average of national polls, Biden held a 51.3%-42.3% lead over Trump among of likely voters as of Saturday.

The percent of undecided voters in October polls four years ago generally ranged from 4% to 9%.

In addition to more undecided voters in 2016, more voters were also willing to vote for Johnson and another third-party candidate, Green Party nominee Jill Stein.

President Donald Trump speaks during a campaign rally at Muskegon County Airport, Saturday, Oct.

"It runs counter to the idea that there's a hidden Trump vote," said David Paleologos, director of the Suffolk University Political Research Center.

More: Could Kanye West's 2020 bid hurt Joe Biden and give a 'Hail Mary' boost to Donald Trump.

Paleologos said 2020 hasn't mirrored 2016 because Biden has not become polarizing like Clinton or Trump.

In contrast, Paleologos said four years ago many voters disliked Clinton "with a higher intensity" than they disliked Trump.

Four years after Democrats felt burned by polls, Biden campaign manager Jen O'Malley Dillon last week sought to dispel any complacency and early celebrating among the left

More: Trump, Biden dueling town halls gave voters a different view of the candidates

More: Trump courts Florida seniors as polls show him lagging with key voting block

Too much drama, let me put it that way," said Gilbert, a Democrat who plans to vote for Biden