The former Commerce Department assistant secretary already has $1.9 million in the bank and has raised more than $2.8 million to date for the campaign in California's 17th district.
Khanna has been boosted by some major tech contributors in the Silicon Valley district, including Facebook chief executive Sheryl Sandberg and Yahoo chief executive Marissa Mayer.
Some other big-name Democrats gave this quarter, including One Kings Lane owner Alison Pincus, who recently hosted Michelle Obama at her home, and Andy Spahn, a major Hollywood-based Democratic donor who is close with other big-name Hollywood liberals, including Jeffrey Katzenberg and David Geffen.
Spahn helped raise nearly $50 million for Obama during his reelection campaign.
"I'm excited to see such a diverse and energized group of people joining our campaign and getting involved in politics for the first time," Khanna said.
"My message is resonating because people have had enough with the dysfunction and finger-pointing in Congress. Folks are calling for new energy and leadership on the economy – and an approach that focuses on finding common ground and delivering results for people, not special interests. As we continue to invest in a grassroots and constituent-driven campaign, I expect the momentum to keep growing."
Honda, a former Democratic National Committee vice chairman, has the endorsements of President Obama and most of the local and national Democratic establishment.
The longtime congressman raised $385,000 in the last three months, he announced Tuesday, a similar amount to the last fundraising quarter. Honda now has $550,000 in the bank.
"Our opponent's campaign, which is dependent on money from people who can afford to write max-out checks, only raised half of what it did last quarter, Honda Campaign Manager Mike Greven said in an email to supporters. "We know that Mike's broad-based support will ensure that we have the resources to fund an aggressive campaign and get him re-elected next year."
This post was updated at 1:55 p.m.