The second debate between Senator Scott Brown and Democrat challenger Elizabeth Warren featured a lot of friction but not much new illumination, lacking a game-changing moment even if it was marked by two stumbles that illustrate lingering challenges for each candidate. For Brown, the Republican incumbent, it came when his careful efforts to modulate his apparent dislike for Warren slipped and he asked her to stop interrupting. Yet Warren raised questions about her own authenticity when asked about her bipartisanship.
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