You’re whole argument is a series of straw mans and doesn’t actually address what I said. You can literally go in and vote for no one or only one down ballot candidate you believe in and that would be far more productive than not voting. I could be the most left wing candidate that ever lived and courting non voters would still be a waste in most elections. How are you going to convince me that courting someone that has voted in last 4 elections is less important than courting someone who skipped the last 4? If you don’t vote, you’ve announced to the world you don’t care and the world responded as expected.

And exit polling doesn’t exist for non voters if they don’t vote… Who are these mythical people who never vote but we have mountains of data on. The primary way parties get data is through voter rolls and party affiliation that they cross reference with purchased metadata. If your not voting they have a choice between targeting reliable voters they know support them and complete mysteries that never vote, be real here.