Answer:
The three States are:
1. Michigan
2. Ohio
3. New Hampshire
Explanation:
These States often receive the most expensive and targeted campaigns during elections since they are considered as 'Swing States'
Unlike 'Safe States' which are generally inclined towards one party, Swing States have a history of changing sides and voting for someone new in every election.
One year they might support a democratic candidate, while in another, they might side with the Republicans. Since it is extremely difficult to predict what they will do, and their decision plays a huge role in who wins the election, they are called 'swing States' and receive a lot of attention.
Nowadays that is quite easy if you have a computer with an internet connection and know how to use it. You need to go to the Senate or the House web page and examine the roll call vote tallies to find the exact record of votes every day.
You can also go to the Congressional record web page for vote tallies for the two chambers of Congress. However it is important to make a difference between the different types of votes since not all of these are recorded by name. Voice votes are only voted by the Congressperson saying “aye” or “no” to a particular proposition or bill. Division or standing votes are voted by raising a hand and then the presiding officers count the Members.
Ships....hope this helps!