G.O.P. Upbeat; Democrats Pin Senate Hopes on Big Turnout

Democratic and Republican candidates across the country are waging the final moments of a fierce, state-by-state effort to turn out their supporters on Tuesday even as voters begin lining up at the polls to express their anger and frustration at the dysfunction and paralysis in Washington.

After spending months locked in loud and often bitter contests about the direction of the country under President Obama’s leadership, national strategists for both parties conceded that the outcomes in a handful of razor-close Senate races would be determined by the composition of an...