Vice President Kamala Harris leads former President Donald Trump in the national polls but has struggled to maintain the momentum she enjoyed early in her candidacy.

Compared to President Joe Biden, Harris is running a successful campaign. She has turned her party’s fears upside down and is two points ahead of Trump nationally. In six of the seven swing states, she is either tied or has a narrow lead over Trump within the margin of error.

But compared to Biden’s polling at this point four years ago, Harris’ lead over Trump is half of Biden’s. Equally troubling is that her lead is a full point lower than Hillary Clinton’s at the same time in 2016.

Despite experiencing a surge immediately after replacing Biden, Harris’ team hasn’t done much to change the playbook it used for the president. Fearing that he would stumble over his words or lose his balance on stage, Biden was kept out of the spotlight as much as possible.

Harris, who herself has a history of clumsy answers to questions, has been similarly shielded from the public, and her policy plans have been opaque. A flurry of statements from campaign staffers and surrogates suggested that the vice president was running on a platform cut from a very different cloth than her 2020 campaign.

She has made few policy proposals in the handful of appearances she has made, and the lack of a plan is starting to scare Democrats.

“It was a mistake to shield Walz and Harris from interviews,” one Democratic lawmaker told NBC News about the lack of exposure Harris and her running mate, Gov. Tim Walz (D-MN), have had. “It’s like basketball, if you don’t play for weeks, you’re not going to get into a game and do well. You have to be on the court.

Without concrete plans for voters, Harris is struggling to convince undecided voters in swing states that she is a better candidate than Trump.

Just a month after the election, 20% of likely voters say their vote is not set in stone.

In 2020, Biden held a 15-point lead over Trump among independent voters, contributing to his razor-thin victory in Arizona, making him the first Democratic presidential candidate to win the state since President Bill Clinton in 1996.

Trump has a four-point lead over Harris with undecided voters.

New York Times columnist Bret Stephens criticized Harris for dodging the press late last month Real Time with Bill Maher.

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Stephens said voters “don’t know her answer to anything.”

“The campaign is taking the risk that time is running out and that Trump’s weaknesses will be enough to win,” Chris Kofinis, a Democratic strategist, told NBC News. “But the danger is that if you don’t define your own candidacy well enough, people will start to define it themselves.”