Furthermore, Feinstein is 84, and running for reelection means that numerous younger Democratic talents in California may not have a clear opportunity to rise through the ranks.
Feinstein, 84, said in a Facebook post that while she's "immensely proud of my service", there is more she wants to do "from ending gun violence, to combating climate change, to ensuring proper and affordable access to healthcare, and to giving DREAMers the chance to stay in the United States".
Progressives are purportedly frustrated enough about her views on President Trump, DACA and single-payer health care to mount a challenge for her seat.
Moulitsas was not the only left-leaning journalist to castigate Feinstein on Twitter shortly after she announced her 2018 Senate bid.
Her analysis came several days after being criticized at a town hall meeting in San Francisco for expressing optimism about Trump becoming "a good president".
California Democrats until recently appeared on a almost endless wait to rise in political circles - with Feinstein and fellow Democrat Barbara Boxer as the state's long-standing US senators and fellow party member Jerry Brown serving four straight terms as governor.
Rep. Ro Khanna (D-CA), who has backed Justice Democrats, called Feinstein "out of touch with the grassroots" on economic and foreign policy. "The fact that the establishment is rallying around her reelection shows that D.C. insiders continued to privilege protecting one of their own over the voters concerns [sic]". The No. 2 Senate Republican, John Cornyn of Texas, has said he's open to legislation and that he'd spoken with Judiciary Committee Chuck Grassley, who was interested in holding a hearing.
Garcetti has repeatedly praised the work of Feinstein, saying he hoped she would run again.
"Regulations aren't going to do it", she said in the interview which airs Sunday morning.
Should Feinstein win, she would be 91 by the end of her term in Congress.
With the prospect of a tough campaign, Feinstein's Senate colleague, Democrat Kamala Harris, released a statement early Monday reiterating support.