Sen. Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.) is fundraising for her presidential campaign off former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE's (D-Texas) announcement that he is also entering the 2020 race.

In a Thursday campaign email with the subject line "Beto O'Rourke," the California senator noted the "record number of Democrats" in the race and said she looks forward to debating her opponents, including O'Rourke.

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“We are facing something unprecedented: a record number of Democrats — including a record number of women and people of color — are running for President. This is greatly encouraging for the future of our country, but there is still a long path ahead of us," she said in the email.

“I look forward to engaging in substantive debates with each of these candidates, including the newest to join the race today, Beto O’Rourke — and ultimately selecting a Democratic nominee who will take on and beat Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE in November of 2020," Harris added.

Harris said to run a winning campaign her team will "have to cut through the noise of this crowded primary and share our message with as many voters as possible."

"That’s why I am planning to spend as much time as possible out on the campaign trail, meeting with communities across the country, listening to the issues affecting them," she said.

Earlier Thursday, O'Rourke officially entered the 2020 Democratic primary race, saying in a video announcing his candidacy that "this is a defining moment of truth for this country and every single one of us."

He is entering a crowded field that, in addition to Harris, includes Sens. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.), Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.), Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.), Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.) and Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.).

Former Vice President Joe Biden Joe BidenOmar fires back at Trump over rally remarks: 'This is my country' Trump mocks Biden appearance, mask use ahead of first debate Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE is also expected to jump into the race.