This study investigates how partisan donors influence congressional candidates' ideological positions. Analyzing U.S. House elections from 2002-2010, the findings reveal a significant trend: candidates show greater responsiveness to their donor base than to primary voters or general election supporters.

Candidate Responsiveness:

• Nominated candidates consistently align more with donors than other voter groups

• This effect varies by party and district competitiveness

Party Differences:

• Democratic nominees respond more strategically in safe districts

• Republican nominees demonstrate consistent responsiveness regardless of competition level

Implications:

These results highlight the polarizing influence of donor networks on American politics, ultimately shaping the ideological landscape of Congress.