Dems turn on leadership they have been voting in lock step with

 Fox News:

As hopes look increasingly bleak for Democrats less than two weeks from Election Day, a number of the party's candidates at risk of losing their races have begun calling for House Speaker Nancy Pelosi, Senate Majority Leader Chuck Schumer and President Biden to be replaced despite their voting records largely aligning with party leaders.

Although Democrats' cries for "new blood" began with the rise of the party's far-left members, such as the "Squad," voters in many areas of the country that aren't buying into "woke" culture, and are seeking a solution to the economic challenges that have become central issues in the midterm elections, are driving these candidates to turn on their leaders.

In September, Democratic Ohio Senate candidate Rep. Tim Ryan, who is trailing in the polls to Republican rival JD Vance, called for the next generation of leadership to take hold of the party when asked in a radio interview if he thought Biden should run for a second term in 2024.

Biden remains widely unpopular across the nation with an underwater approval rating, including in Ohio, where some of the the latest polls show just 37% of voters approving of his job performance as president.

"My hunch is that we need new leadership across the board," Ryan said, including the Republican Party in his comments. "Democrats, Republicans — I think it’s time for a generational move."

Ryan hasn't invited Biden to join him on the campaign trail as he seeks to make up ground against Vance, and recently vented frustration that national Democrats weren't investing more money into his race.

Despite his calls for a party leadership change, Ryan's voting record while in Congress shows he's voted in tandem with Biden 100% of the time, according to FiveThirtyEight. Data from ProPublica shows he's also voted with Pelosi 100% of the time.
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"This moment marks a failure of House leadership — and it’s yet another example of why I believe that the Democratic Party needs new leaders in the halls of Capitol Hill, as I have long made known," Spanberger said in the release, noting her previous calls for a leadership change.

Despite her calls for change, she has voted in tandem with Pelosi 92% of the time, according to ProPublica.

Spanberger faces a tough re-election bid in Virginia's newly drawn 7th Congressional District against Republican challenger Yesli Vega, a race that Fox News has rated as "lean Democratic."
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There is more.

The Democrats are being hurt by having a really slim majority which has no room to allow those in a difficult race to not vote with the leadership.  The leadership agenda does not have the majority support of the voters, so there they are.