PORTLAND, Maine (AP) – In a surprise announcement, moderate GOP Sen. Olympia Snowe said Tuesday she would abandon her campaign for a fourth term—a contest she was expected to win easily—because she is frustrated by a polarized atmosphere in Washington.

The move dealt an immediate blow to Republicans hoping to take control of the Senate in November by giving Democrats new hope of winning the longtime GOP-held seat.

“As I have long said, what motivates me is producing results for those who have entrusted me to be their voice and their champion, and I am filled with that same sense

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