Washington (CNN) - A day after she shocked her colleagues and constituents by announcing her retirement, moderate Republican Sen. Olympia Snowe of Maine explained her decision and defended tough criticism she leveled at her colleagues when she announced why she would leave the Senate.

"People are just stunned by the debilitating partisanship, polarization and the overall dysfunction of the institution and political paralysis as we come, you know, to the point of extreme when it comes to resolving the problems facing our country," a frustrated Snowe told CNN Wednesday. "It's become an all or nothing proposition and that failure has eroded the public's confidence about the direction of this country and about governing institutions to be at the front lines of solving these problems."
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