Political control of the Arizona Senate is on the ballot, with Democrats seeking to break a nearly 25-year string of Republican dominance. Voters' choices in several swing districts will determine whether Republicans retain control,

Republicans won control of the Senate in Tuesday’s elections, gaining seats in West Virginia and Ohio. Other tight races remained too close to call in both the House and the Senate, as Democrats were hoping to win a House majority as voters across the nation cast ballots.

Odds have favored the GOP this entire election cycle, with all of the most competitive races in states represented by vulnerable Democratic senators. The retirement of Democrat-turned-independent Sen.

Americans are poised to elect a new Congress as every seat in the House of Representatives and one-third of the Senate is up before voters on Election Day.

Republicans seized control of the U.S. Senate late Tuesday after flipping Democratic held seats, holding onto GOP incumbents and wresting away the majority for the first time in four years.