The preposition is after, so you couldn't just say We've worked state state... If you're asking about using the past or present tense, it depends if you are referring to something that already happened or something that is currently happening.
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maelstromIs the preposition here necessary?Elanguest understandably thought you were asking about 'after'.
maelstrom Is the preposition here necessary?Can I simply say "work state after state"(such as in "We've worked state after state to protect vulnerable voters)?THANKS IN ADVANCE:)I would say "We've gone from state to state working to protect..."