Senate Minority Leader Mitch McConnell (R-Ky.) is urging his fellow Republicans to buck up Sen. Kyrsten Sinema of Arizona — a Democrat, sources familiar with the conversations tell Axios.Why it matters: Republicans view Sinema and her moderate Democratic colleague Sen. Joe Manchin of West Virginia as their last line of defense against sweeping progressive laws — ranging from a $3.5 trillion social welfare bill to potentially irreversible structural changes like eliminating the filibuster and add

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