Sang-mi, tell us about the seats up for grabs now.
Right, Mark, as for the seats for grabs, there are two chambers in Congress. In the lower chamber,.. the House of Representatives, all 435 seats are on the line.
Then, in the upper chamber,.. the Senate, there are 100 seats... but this time around, only about a third of them... 35 seats are being contended.
At the moment, Republicans control both chambers.
In the House, they hold a 235-to-193 majority.
So, for Democrats to take control of the House, they will need to flip 23 seats.
Those seats are apportioned based on the relative population of each state, so California, for instance, gets the most with 53 seats -- Alaska... gets one.
The members serve two-year terms.
It's much tighter in the Senate, where the Republicans have only two more seats.
Senators serve for six years and each state gets two, regardless of population.
The current Congress runs until January 3rd.
