Sen. Kamala Harris Kamala HarrisThe Hill's Campaign Report: Trump and Biden vie for Minnesota | Early voting begins in four states | Blue state GOP governors back Susan Collins Kamala Harris: Black Americans have been 'disproportionately harmed' by Trump Biden town hall draws 3.3 million viewers for CNN MORE (D-Calif.) has raised more than $600,000 in the first six months of the year for her Senate colleagues up for reelection in 2018, CNN reported Saturday.

More than half of that – $365,000 – from small dollar online donations.

The freshman senator has quickly risen to stardom in Democratic circles since taking office in January. And along with her political profile, her email list of potential donors has also grown.

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According to CNN, that list, which Harris has used to amass most of the money in the $600,000 warchest, is 10-times larger than it was at this time last year, when she was running for the Senate.

Harris is also planning a fundraising tour in the fall to help Democratic incumbents in the Senate, as well as Democrats challenging incumbent Republicans for their House seats.

Speculation has swirled in Washington and in Democratic circles that Harris, who has been a merciless critic of the Trump administration in its first several months, could be a prime contender for the party's presidential nomination in 2020.