Warren, 69, who became a senator from MA in 2013, has frequently clashed with Trump, who has cast aspersions on Warren's claim to Native American ancestry and mockingly referred to her as "Pocahontas". "We got a real opportunity to build something", Warren says.
In 2017 former Democratic congressman John Delaney of Maryland announced he would seek the party's nomination.
Warren's possible strength in what will be a crowded contest includes her track record of speaking to economic concerns. This backdrop could prove to be a boon for Warren, who is widely expected to build a campaign centered around her signature economic populist message and anti-corruption platform.
Dan Geldon, Warren's longtime aide who served as her chief of staff in the Senate and was once the senator's student at Harvard Law School, is likely to serve a senior role in the eventual Warren campaign, the source said. Warren is taking the first major step toward running for president.
Warren uses the time-honored technique of labeling conservatives of being racists and homophobes after attacking the government as a "tool for the wealthy". Two other well-known figures, former Vice President Joe Biden, 76, and Vermont Sen. In a liberal state, Gov. Charlie Baker, R, got more votes than she did in November, and a recent survey in MA had her trailing former vice president Joe Biden and Sanders in a hypothetical 2020 matchup. One of the biggest criticisms of Hillary Clinton's failed 2016 bid was a focus on appealing to specific demographic groups, particularly marginalized groups, alienating white, working-class voters who helped elect Trump.
Trump has cast aspersions on Warren's claim to Native American ancestry, referring to her as "Pocahontas". "Current DNA tests do not even distinguish whether a person's ancestors were indigenous to North or South America".
The Cherokee Nation responded to the results at the time by arguing that "a DNA test is useless to determine tribal citizenship".
Formerly a professor of law at Harvard, the MA senator is considered to be on the liberal wing of the Democrat Party.
"There are different theories on being effective, but she believes in picking issues that are super popular and forging coalitions to win on those issues", he said.
Warren's entrance into the contest to try and challenge President Trump in 2020 is a development he's likely to relish. "Others can be more of a loner, or willing to charge into battle first before having a fully baked plan".