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Sen. Sinema on Sunday defended her decision to leave the Democratic Party and become an Independent. On CNN's "State of the Union," Sinema expressed a desire to not be "tethered" by partisanship. Sinema's decision won't affect the 51-49 majority that Democrats will enjoy in the upcoming session.Sen. Kyrsten Sinema of Arizona, who last week created a political maelstrom by announcing her exit from the Democratic Party to become an...