Grok:
🔥 Yes, a SCOTUS ruling against grace periods for mail-in ballots (as in Watson v. Rep Nat’l Cte) would likely affect the ongoing California June 2, 2026 primary results, at least for any ballots still being processed or challenged.
The Case and Likely Ruling
In Watson v. RNC, the Supreme Court is considering whether federal law (setting Election Day as the Tuesday after the first Monday in November for federal offices) requires ballots to be received by Election Day, or if states can count those postmarked by Election Day but arriving shortly after (a “grace period”). Oral arguments in March 2026 suggested a conservative majority is skeptical of grace periods, with many observers expecting the Court to side with the challengers and strike down Mississippi’s 5-day window.
• A decision is expected by late June 2026 (end of the term).71
• This would invalidate similar laws in ~14–15 states D.C., including California’s 7-day window for ballots postmarked by Election Day.
The ruling would apply to federal elections (including those with federal candidates on the ballot, like this primary for U.S. House seats, governor, etc.)
Impact on California’s June 2, 2026 Primary
California is a universal mail-in ballot state. For the June 2 primary:
• Ballots must be postmarked by June 2 and received by June 9 to count under current state law.0
• As of early June 2026 (around June 5–7), counting was ongoing: ~5.6–6 million ballots processed, w/ millions (mostly mail-ins) still pending. Races like governor (Becerra leading Hilton narrowly in some reports) and LA mayor were unresolved, with canvassing continuing into July.
If SCOTUS rules that ballots must be received by Election Day:
• Ballots arriving June 3–9 (even if properly postmarked) could become invalid for federal races/offices.
• Election officials were already advised to track/separate late-arriving ballots in preparation.
• This could shift close races if late mail ballots disproportionately favor one side (common in mail-heavy, Democratic-leaning areas). It might also trigger lawsuits, recounts, or certification delays.
• Full certification is due July 10, so a ruling before then could force re-canvassing or exclusions.
Not every ballot would be affected — only those received after June 2. In-person and timely-received mail ballots stay valid. The share of “grace period” ballots is usually small but can matter in tight races (hundreds of thousands nationwide in past elections).
Broader Context and Limitations
• Retroactivity/Remedies: Courts often avoid massive mid-process disruptions (Purcell principle), but since counting is incomplete and a ruling could come soon, it’s plausible late ballots get segregated or excluded. California officials have called it potentially disenfranchising for millions over time.
• This wouldn’t retroactively undo already-certified past elections, but hits this primary and future ones (e.g., November midterms).
• California could try workarounds for state-only races, but federal preemption would control mixed ballots.
Registrars should (and reportedly are) preparing by separating post-Election Day arrivals.
This is a real wildcard for ongoing tallies.
Watch for the SCOTUS opinion in the coming weeks—it could accelerate results in future elections by pushing earlier mailing/drop-off, but risks rejecting valid votes due to postal delays.