Elizabeth Warren is the only candidate to consistently rise in the polls.

[bluewater]

That could make her the candidate to beat in the 2020 primaries.

Former Vice President Joe Biden has been the frontrunner of the Democratic primary race so far, but he's at risk of losing his spot at the top to Sen. Elizabeth Warren, the progressive firebrand senator.

Warren, who entered the race last December, has experienced a meteoric rise in basically every possible metric. She's up in Democratic primary polls, approval rating, fundraising, and even crowd size, while Biden's support and favorability are dwindling down over time.
[snip]
But in the following months, Warren proved her detractors wrong by fully embracing the role of the policy wonk. She's released a unique and detailed policy plan to address almost every imaginable issue from the cost of college to the opioid crisis, rolling out so many policies that "I've got a plan for that" has become her unofficial slogan.

While her choice to eschew private fundraisers was initially seen as a huge liability, not courting wealthy donors has enabled Warren to spend more time on the campaign trail, where she has thrived.

And on the eve of the next narrowed-down Democratic primary debate, Warren appears to be overtaking Sen. Bernie Sanders as the 2020 field's progressive standard-bearer, while Biden's stronghold on the race is fading fast.

https://www.businessinsider.com/elizabeth-warren-becoming-candidate-to-beat-2019-8