Because of the Electoral College, presidential candidates generally spend most of their time and resources in battleground states. Hence, the correct answer is battleground states.
These are the states that are considered to be closely contested in the election and could potentially swing either way. Candidates will often focus their attention on these states, as they can have a significant impact on the outcome of the election. By doing so, they can maximize their chances of winning the election by targeting their resources to where they are most likely to make a difference.
Hence, battleground states is the correct option to be filled in blank.
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