Iowa is a heavily contested presidential battleground. Al Gore won the state by just 0.3 percentage points in 2000, while George W. Bush won in 2004 by 0.7 percentage points. Bush was the first GOP presidential candidate to carry Iowa in 20 years. Barack Obama won with 54% in 2008 and 52% in 2012. See 2020 primary results
CNN will broadcast a projected winner only after an extensive review of data from a number of sources.
"Flipped seat" denotes a race where the 2020 projected winner is from a different party than the previous winner or incumbent.
Both Maine and Nebraska allow electoral votes to be split. In Maine, two of four electoral votes go to the statewide winner and one electoral vote goes to the winner in each of the two congressional districts. In Nebraska, two of five electoral votes go to the winner of the statewide vote. One electoral vote goes to the winner in each of Nebraska's three congressional districts.