However, Ocasio-Cortez has seen an explosion in popularity, thanks especially to Facebook and Twitter, neither of which existed when Lieberman ran for vice president in 2000. "We just don't need sniping in our Democratic Caucus".
According to the NYDN, a "Democratic campaign veteran scoffed that "it's not a great look" for Ocasio-Cortez that her campaign received a fine for not carrying workers' compensation coverage". Ocasio-Cortez thrust that issue into the national dialogue after she joined a sit-in protest in the office of then-incoming House speaker, Rep. Nancy Pelosi, in one of her first, rebellious acts in Washington.
Incumbent Democrats are most annoyed by Ocasio-Cortez's threat to back primary opponents against members of their ranks she deems too moderate.
Since upsetting six-term incumbent Joe Crowley in a primary last summer and winning election to Crowley's old seat in November, Ocasio-Cortez has used her huge social-media following to chastise fellow Democrats she believes are insufficiently progressive and too beholden to the antiquated establishment.
"There's a difference between being an activist and a lawmaker in Congress", the source said.
"The so-called champion of workers, when given her own responsibility, is not following the law".
"The restaurant I used to work at is closing its doors", she wrote in a tweet.
In private conversations, Velázquez told Ocasio-Cortez not to target her Democratic colleagues and to think twice before backing primary candidates against elected Democrats.
A spokeswoman for the NY state Workers' Compensation Board, Melissa Stewart, said Friday that Ocasio-Cortez's Democratic campaign lacked coverage from March 31 to April 30.
"She's new here, feeling her way around", Rep. Kurt Schrader (D., Ore.) said.
Ocasio-Cortez also advocates for an ambitious "Green New Deal" that calls for a transition to a 100 percent renewable energy system and the complete replacement of America's power grid as a means of generating jobs and saving the natural environment.
The Politico report follows criticism from high profile former members of Congress like Democrat Claire McCaskill, a former senator from Missouri.