Capitol Hill. Photo: Wiki Commons.

CNN – Republicans are spending the final weekend of campaigning before Tuesday’s election sizing up the possibility of their first Senate majority in nearly a decade, but with key races still too close to call.

Latest polls show some critical Senate races tightening, guaranteeing a night of drama and suspense on Tuesday, as Republicans strive for a net gain of six seats to capture the chamber. A GOP victory would give the party complete control on Capitol Hill and the ability to constrain President Barack Obama’s final two years in office.

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