The League of Conservation Voters plans to spend a “majority” of the $25 million it has raised for the November elections on its Senate ground game, largely by targeting 1.5 million “drop-off voters” who typically don’t participate in midterm elections and tend to be younger, Hispanic and female.

Such voters are in the environmental group’s “wheelhouse,” said Amy Levin, a partner with the Benenson Strategy Group, which did polling for the group.