Why Barbara Mikulski's retirement doesn't reshape the battle for the Senate

Sen. Barbara Mikulski, the longest serving woman in the history of Congress, said Monday that asking herself, "who am I campaigning for?" led her to her decision to retire. Democratic Sen. Barbara Mikulski's decision to retire promises to shake up politics in Maryland this year and next, but it doesn't appear to immediately alter the broader battle for the Senate majority in a major way.

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