Rep. Adam Schiff (D-CA) is narrowly leading Rep. Katie Porter (D-CA) in the Democratic primary to replace retiring Sen. Dianne Feinstein (D-CA), according to a new poll released by the University of California, Berkeley, and the Los Angeles Times on Thursday.

Twenty-two percent of those surveyed said they support Schiff, whose national profile skyrocketed during the impeachment trials of former President Donald Trump, while Porter took in 20% among Democratic and nonpartisan voters. Rep. Barbara Lee (D-CA), the former chairwoman of the Congressional Black Caucus who announced her bid on Tuesday, trailed at 6%, while Rep. Ro Khanna (D-CA), who has not entered the race, polled at 4%.

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The early poll found that Schiff performed better with adults over the age of 40, while Porter, who has also built her national profile during her time in the House, had stronger numbers with younger voters. Porter outperformed Schiff with progressives, and the former House Intelligence Committee chairman fared better among moderates.

“An analysis of Democratic and No Party Preference voter support across demographic subgroups shows fairly wide differences in support by age, with voters under age 40 preferring Porter over Schiff more than two to one, while older voters favor Schiff greater than two to one,” the poll analysis said.

“Preferences in the Senate race are also related to the political ideology of the voter," the analysis added. "Democrats and No Party Preference voters who identify themselves as strongly liberal in politics prefer Porter over Schiff by 11 points, whereas voters identifying as moderates favor Schiff by 12 points."

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While the poll showed Schiff with a slight early lead, 39% of those polled said they are undecided, with 8% saying they plan to support an unlisted candidate.

The poll was conducted in English and Spanish from Feb. 14-20 and surveyed 7,512 registered independent and Democratic California voters. It has a 2.5-point margin of error.