Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE asks why she is seen as a "divisive figure" over her past votes on the Iraq War while others escaped blame in her new book that examines her failed 2016 run for president.

In "What Happened," Clinton questions why other mainstream Democratic politicians haven't faced the same scrutiny over their 2003 support for the Iraq War, while Clinton herself was attacked over the vote by primary rival Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.), The Washington Post reported in a review of the book.

“Why am I seen as such a divisive figure and, say, Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE and John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE aren’t?” she asks. “They’ve cast votes of all kinds, including some they regret, just like me? What makes me such a lightning rod for fury?"

"I’m really asking. I’m at a loss,” Clinton adds.

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During the campaign, Clinton's vote on the Iraq War was used against her as a sign of her "judgment" in tough situations. Former Vice President Joe Biden and former Secretary of State John Kerry also both voted for the war during their respective Senate terms.

Sanders initially questioned her judgment during the primaries, an attack that was echoed by then-candidate Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE during the general election.

“Emails, bad judgment. Iraq, voted yes, bad judgment. Libya, bad judgment. All bad judgment," Trump said at a 2016 rally. “He said she suffers from bad judgment,” Trump said in 2016, referring to Sanders. “It's true.”

Clinton called the 2003 vote a "mistake" in a 2015 interview with reporters shortly after announcing her presidential run.

"I've made it very clear that I made a mistake, plain and simple, and I have written about it in my book. I’ve talked about it in the past," Clinton said at the time.