Exit polls show voters angry at Obama and Republicans in Congress

1. The US midterm elections are today.
2. The Democrat-controlled Senate could swing to Republicans.
3. Republicans need just 6 seats to control the upper house.
4. 10 states in particular are in contentious battles.
5. All 435 seats in the House are on the ballot as well.
6. Democrats are unlikely to take control of the lower house.
7. Rep and Dem parties have spent $4 billion on attack ads.