Dem senator: 'You can’t just waltz’ to primary win
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Sen. Amy KlobucharAmy Jean Klobuchar2020 hopeful John Delaney unveils T climate plan Samantha Bee slams 2020 Democrats who go on Fox News Poll: Harris, Warren climb as Biden maintains lead MORE (D-Minn.) said on Sunday that Hillary ClintonHillary Diane Rodham ClintonFrustration boils over with Senate's 'legislative graveyard' Poll: Nearly half of Clinton's former supporters back Biden Harris readies a Phase 2 as she seeks to rejuvenate campaign MORE is not exempt from a fierce battle in the 2016 Democratic presidential primary.

“You can’t just waltz in and win a Democratic primary,” Klobuchar told host Martha Raddatz on ABC’s “This Week.” 

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“We’ve seen many people in the past think they could do that, and that’s not what happened,” Klobuchar, a Clinton supporter, added.

Klobuchar argued on Sunday that Clinton, the current front-runner for their party’s presidential nomination, is taking the right approach.

“I think you have heard from her directly from the very beginning that this is not a coronation,” she said of the former first lady.

“I think she has approached this with vigor from the beginning,” Klobuchar said. “I think she’s running a strong campaign. It has energy.”

Klobuchar’s remarks comes as Clinton struggles with public support following national controversy over her use of a private email server while serving as secretary of State.

“There’s a lot of partisan stuff going on that’s not fair to her,” Klobuchar said of Clinton. 

“But in this case, she had to take responsibility for what she did,” she said. “And she did. She said she should have had two different email accounts, that she should have done this differently.”

Voter concerns over the issue are gradually eroding Clinton's lead in the Democratic race across multiple national polls.