I literally don’t think there’s any number that they won’t deny as being a legitimate win. Way back in 2016 Trump claimed that he would have won California if not for “massive fraud” even though Clinton’s margin was nearly 2:1 there. The whole party has only gotten more unhinged since then.
But if the results are strong enough in the Democrats’ favor at least some of the not-yet-totally-insane parts of the judiciary may not be onboard with the GQP stealing it. So we have to have hope.