Republicans confident they will seize control of US Senate in midterm polls
But with several races too close to call, it could be weeks before makeup of Senate is settled

Millions of American voters went to the polls in midterm elections yesterday with the Republicans poised to celebrate victory and confident they will take control of the Senate.
Recent polls show Republicans pulling ahead of President Barack Obama's Democrats in the battle for power in Washington, despite the races in Alaska and North Carolina remaining very close.
But the nation may still have to wait until next month or even early next year to learn who controls the chamber after yesterday's vote.
Republican leaders expressed confidence in the home stretch of one of the most consequential midterm elections in years.
Democrats hold a 10-seat Senate advantage, with 55 members to 45.