Exit polls are based on thousands of interviews carried out outside polling stations.
The exit polls are based on a much larger sample than the numerous opinion polls before the election.
The Election Day polls were based on questionnaires completed by voters leaving voting stations in six states yesterday.
The Indiana and North Carolina exit polls were based on questionnaires completed by voters in each state's primary election.
The Election Day polls were based on questionnaires completed yesterday by voters leaving voting stations throughout Michigan and Arizona.
The exit polls were based on questionnaires completed by voters on Tuesday as they left primary election locations in Georgia, Massachusetts, Ohio and Tennessee.
How The Exit Polls Were Conducted The exit polls were based on questionnaires completed by voters on Tuesday as they left primary election locations throughout the country.
"A lot of differences in these polls are based on how tightly polls are screening voters," Nate Silver, of FiveThirtyEight, tweeted last week.
How the Polls Were Conducted The Election Day polls were based on questionnaires completed by voters as they left voting stations throughout New York City and New Jersey yesterday.
How the Voter Polls Were Conducted The primary day polls were based on questionnaires completed by voters as they left voting stations yesterday throughout Arizona, Missouri, Oklahoma and South Carolina.
