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Susan Collins, R-Maine, and Democratic challenger Troy Jackson engaged in a contentious fourth debate Thursday night.
The exchange focused on billionaire financial contributions, political loyalty, and the candidates' backgrounds, marking a shift toward personal attacks.
Jackson questioned whether Collins had effectively challenged Republican decisions she opposed, while Collins raised doubts about Jackson's willingness to confront his own party when it conflicts with Maine's interests.
Early in the program, Collins pressed Jackson on his campaign pledge to reject billionaire donors. She referenced Federal Election Commission records that appeared to contradict his previous assurances.
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