Kamala Harris needs to win over her doubters and detractors, analysts say — and soon

• U.S. President Joe Biden's decision to drop out of the presidential race on Sunday and to endorse Vice President Kamala Harris as the Democratic nominee, gives Harris very little time to turn around her mixed political standing.
• With just over 100 days until the presidential election in November, Harris now has the hard task of winning the Democrats' official nomination and of winning over her detractors and undecided voters.

The pressure is on Vice President Kamala Harris to turn around her political fortunes and win the Democratic Party's nomination, analysts say, after U.S. President Joe Biden dropped out of the presidential race.

With just over 100 days until the presidential election in November, Harris now has to win over not only Democratic delegates, donors and secure an official nomination by the party, but also — and most crucially — her detractors and undecided voters.

"This is not a smooth road ahead for Democrats. Donald Trump and [running mate, Sen.] JD Vance are a very strong ticket that clearly appeal to a large segment of America, but I think Kamala Harris can give them a good run for their money," Lew Lukens, senior partner at Signum Global Advisors, told CNBC Monday.

"I'm not saying it's going to be easy for Kamala Harris ... but I do think we have to give her the opportunity to be the candidate," he noted.

"The vice presidential role, by its very definition, is very much behind the scenes, playing second fiddle to the president. Now she's suddenly been thrust into the spotlight [as the person] who will most likely be the [Democratic] nominee, so it's a very new role for her and we'll have to see if she grows into that role," Lukens told CNBC's "Squawk Box Europe."

Harris is the first woman, and