55,286 mail ballots have been counted. Incumbent County Executive Marc Elrich won them by 1,499 votes, allowing him to make up his somewhat smaller election night deficit.
The results thus far disprove the theory that later mail ballots would tend to help Blair more as they were cast after he received the WaPo endorsement and his campaign really amped up. Elrich did well in the initial sets of ballots but also the most recent sets, which overall would have been cast later. David Blair did well in between.
There are a total of 63,584 mail ballots, so around 8,000 more to count. The exact total is unclear as some undoubtedly did not vote in the primary for county executive who cast ballots. But surprisingly few, I imagine, since more voted in that contest than in the top-level gubernatorial primary (555 more by the current count). This is highly unusual as people tend to roll-off and vote less as they move down the ballot.
Of course, provisional ballots also remain to be counted. That count may go even more slowly with the need to check the eligibility of each voter. But most will be deemed eligible and counted. No idea here on who will win those critical ballots.