Rep. Katherine Clark, the House Democratic Whip and second-highest ranking Democrat in Congress, won her primary Tuesday in Massachusetts' safely Democratic 5th Congressional District, fending off two progressive challengers who sought to make Gaza policy and pro-Israel political spending central issues in the race.
Clark defeated Jonathan Paz, a former city councilor, educator and union organizer, and Tarik Samman, a 27-year-old Harvard Law School researcher and union organizer. She has represented the Boston-area district since winning a special election in 2013 and has served as House Democratic Whip since 2022.
The primary fight drew national attention as an early test of whether progressive voters would punish mainstream Democrats for their relationship with AIPAC, the American Israel Public Affairs Committee, which endorsed Clark and has contributed to her campaign.
What the Left Is Saying
Progressive challengers Paz and Samman argued that while Clark had increasingly criticized Israel's conduct in Gaza, she should renounce the AIPAC money she accepted. They positioned the race as a referendum on Democratic Party loyalty to progressive values on foreign policy.
Samman, 27, argued that accepting AIPAC contributions compromised Clark's ability to advocate for Palestinian civilians affected by the conflict. Paz similarly called for Clark to return or refuse pro-Israel lobbying funds.
The challengers pointed to Clark's July vote to cut $3.3 billion in U.S. military aid to Israel as evidence she had moved in their direction, but argued it did not go far enough. Last year, Clark used the word "genocide" at a district event before clarifying she was not accusing Israel of genocide.
Progressive groups nationally watched the race closely, seeing potential implications for other Democratic incumbents who have faced primary challenges tied to Israel policy.
What the Right Is Saying
Clark's supporters emphasized her record as an effective legislative leader and argued her nuanced position on Israel reflected mainstream Democratic views. They noted she has continued to support Israel as a sovereign Jewish state while expressing criticism of Prime Minister Benjamin Netanyahu's government.
Republicans highlighted Clark's $4.5 million fundraising haul, dwarfing both challengers combined, as evidence the race was never truly competitive despite progressive challenges. FEC filings showed Paz raised $88,500 and Samman brought in $43,800.
Conservative commentators argued the primary challenge demonstrated Democratic Party divisions that could complicate messaging ahead of the 2026 midterms. They noted Clark's position as House Minority Leader Hakeem Jeffries' top deputy made her survival strategically important for party leadership.
Some Republican strategists suggested the race showed limits to progressive electoral power even in safely blue districts, while others pointed to the fundraising disparity as the true story rather than any ideological shift.
What the Numbers Show
Clark's $4.5 million in fundraising vastly outpaced both challengers combined by a ratio of roughly 33-to-1. Paz raised $88,500 and Samman brought in $43,800, according to FEC filings through the reporting period.
In her most recent general election, Clark defeated Republican Caroline Colarusso 74% to 26% in 2022. She ran unopposed in 2024, meaning Tuesday's primary was her first contested race since 2022.
Clark voted in July to cut $3.3 billion in U.S. military aid to Israel, a significant position for a mainstream Democratic leader. AIPAC has been among the most influential lobbying groups advocating for continued U.S. military assistance to Israel amid the Gaza conflict.
The district's safely Democratic status means whoever wins the primary is virtually certain to represent it in Congress, making party primaries effectively determinative of representation.
The Bottom Line
Clark's victory preserves Democratic leadership stability as Jeffries' top deputy heading into the 2026 midterm cycle. Her survival suggests mainstream Democrats can navigate the party's internal divisions on Israel without losing their seats, at least in safely blue districts with significant resources.
The race also illustrates how progressive challengers are targeting incumbents on foreign policy issues more frequently. Both Paz and Samman centered their campaigns on AIPAC money, a sign that pro-Israel lobbying will remain a fault line in Democratic primaries regardless of outcomes.
What remains unclear is whether Clark's approach—criticizing Netanyahu while accepting AIPAC support and supporting some defensive aid—represents a sustainable middle path or an unstable equilibrium. National progressive groups are likely to test other incumbents with similar profiles in upcoming cycles.