Things to look for in Tuesday’s midterm elections:

Control of the Senate:

• The Republicans need to pick up six seats in order to gain the majority. They have about a 70 percent chance of doing so, according to the latest forecast from The Upshot.

• They appear to be in strong position to win four seats held by Democrats — in Arkansas, Montana, South Dakota and West Virginia.

• The task could be complicated if they lose Republican-held seats in Georgia, Kansas and Kentucky — three races that remain close.

• The other Senate races that will likely will determine the balance of power are in purple states currently held by Democrats — Alaska, Colorado, Iowa, New Hampshire and North Carolina.