Over 2/3 of the 96 general-election campaign events (69 of 96) during the first 7 weeks of the 2020 campaign have been in just 6 closely divided battleground states -- Florida, Pennsylvania, Michigan, North Carolina, Wisconsin, and Arizona.
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Meanwhile, 7/8 of TV ad spending ($884,000,000 of $1,015,000,000) is in the same 6 states.
NPR story
All of the events have been in just 13 states -- meaning that 37 states have gotten no attention whatsoever.
The reason why voters in so few states are getting so much attention is that most states award their electoral votes to the candidate who gets the most popular votes inside each separate state.
Because of these so-called "winner-take-all" laws, candidates only pay attention to voters if they live in a state where the presidential race is within a few percentage points.
The National Popular Vote bill would guarantee the Presidency to the candidate receiving the most popular votes in all 50 states and D.C.
National Popular Vote offers a way to make every voter in every state matter in every presidential election.