Seven weeks of the online fight over California’s Prop 40, set beside the polls, ahead of Nov 3.
Key finding: Online, the Yes side won the conversation all fall. In the polls, support fell. The latest survey, finished Oct 25, has No ahead 50 to 42.
About this series
Ballot Signals is a daily narrative intelligence series on 2026’s biggest ballot fights. Each day until Election Day, we publish a Rolli IQ report on one measure and set it beside the latest public polling. On Nov 4, we check the signals against the results. This is Report 2.
| Date | Measure and what it does | Our question |
|---|---|---|
| Thu Oct 29 | AI data centers Local votes to ban, pause or require approval for new data centers. |
Where is the opposition going? |
| Fri Oct 30 | California Prop 40 (this report) A one-time 5% tax on the wealth of Californians worth over $1 billion, mostly for health care. |
Yes won the feed while it lost ground in the polls. What explains the gap? |
| Sat Oct 31 | Missouri Amendment 3 Would repeal the abortion-rights amendment voters passed in 2024, ban most abortions with exceptions, and ban gender-transition procedures for minors. |
Polls show a 43 to 43 tie. Which side’s message is landing? |
| Sun Nov 1 | Montana I-194 Would bar corporations, unions and other groups from spending to influence Montana elections, a test of the Citizens United ruling. |
There is no public poll. What does the conversation show? |
| Mon Nov 2 | California Prop 39 Would require voters to show ID, add ID numbers to mail ballots, and check voters’ citizenship. |
Voter ID polls well, yet the measure trails 42 to 51. Why the gap? |
| Wed Nov 4 | The results What the online signals showed, next to what voters decided. |
Did the signals hold? |
What Prop 40 would do
Prop 40 would place a one-time 5% tax on the net worth of Californians worth more than $1 billion, an estimated 200 people, with most of the money going to health care. Two rival measures share the ballot, Props 41 and 42, and Prop 40’s backers oppose both. Prop 42 would ban new taxes on personal property. If it passes with more votes than Prop 40, it cancels it.
In one page
Polls tell you how many voters lean each way. The conversation shows which arguments are getting attention and who is carrying them. Here is what it adds on Prop 40.
Online, Yes got louder. In the polls, it lost ground.
Between September and October, Yes fell 6 points in PPIC’s polls, from 52% to 46%. Berkeley IGS found the same direction: 45% in September, 42% in its poll that closed Oct 25. Over the same period, the Yes side’s share of engagement on the most popular X posts rose from 72% to 90%. These are different measures, one of voters and one of attention, so the point is the direction, not the gap. The side that owned the feed lost ground with voters.
Yes was carried by national voices: Sen. Bernie Sanders, Rep. Ro Khanna, Mark Ruffalo and Robert Reich. Neither Gov. Newsom nor the official No campaign appears among the top posts.
| Poll | Field dates | Yes | No | Undecided |
|---|---|---|---|---|
| PPIC Statewide Survey (likely voters) | Sep 4–10 | 52% | 46% | 2% |
| Citrin Center/POLITICO | Sep 8–14 | 45% | 43% | 12% |
| Berkeley IGS (likely voters) | Sep 15–20 | 45% | 42% | 13% |
| PPIC Statewide Survey (likely voters) | Oct 16–22 | 46% | 52% | 2% |
| Berkeley IGS/LA Times (likely voters) | Oct 19–25 | 42% | 50% | not reported |
Sources: PPIC Statewide Survey; Citrin Center/POLITICO; Berkeley IGS, with the LA Times for the October poll. Results as reported by each pollster.
From fair share to flight
We sorted the conversation into five storylines: fair share and health care, billionaire spending against the measure, Newsom and Props 41 and 42, worries about whether the tax is really one-time, and billionaires leaving the state. Engagement grew ninefold over the fall, and the leading storyline changed about every two weeks. Fair share opened the fall. Spending took over from late September into early October, after reports that Google cofounder Sergey Brin had put $102 million into the fight. Then Newsom. In the final stretch, billionaires leaving took 53% of the conversation.
Newsom backed Prop 42. The fight turned inward.
On Oct 9, Gov. Newsom backed Prop 42. In the two weeks that followed, the conversation about him and the rival measures rose from 14% to 32% of all engagement, much of it criticism from progressives. PPIC later found the October drop in support concentrated among Democrats and independents. The data can’t say whether one caused the other. It does raise a question worth asking: did Newsom give Democrats permission to vote no?
The worry the feed misses
In the Citrin Center/POLITICO poll, 64% of voters said they were not confident the tax would stay one-time. Online, that worry barely registers: only 3% of engagement went to one-time, retroactive or 401(k) concerns. That argument appears to live in paid media, where the No side has raised about four times as much as Yes, according to Secretary of State filings through Oct 22. One public post on Threads put it plainly: a voter leaning yes until a commercial warned the tax would hit their 401(k).
The biggest spike hit as the October polls closed
Billionaires leaving was close to zero for most of the fall. Then, on Oct 21, a Meta SEC filing raised the possibility that Mark Zuckerberg could leave California if Prop 40 passed, while others read the same filing as a sign he was preparing to pay. A week later, Minecraft creator Markus Persson listed his California home. The storyline jumped to 374,000 interactions in nine days, more than every other storyline combined. Both October polls were in the field when the story broke, so neither fully captures it. Each side read the same news differently: the Yes side called it a bluff, the No side called it proof.
Yes ran on anger. Flight spread as news.
Rolli IQ labels the emotion in each post. On the most-engaged X posts, Yes-side engagement was 77% anger, aimed squarely at billionaires, and 18% happiness. No-side engagement split between disgust and anger. The biggest flight posts were straight news headlines about Zuckerberg and Persson, with no emotion detected, and they drew more engagement than all the top No-side posts combined.
Same fight, different rooms
Each platform carried a different version of the fight. On X, senators, members of Congress and commentators made the case. Reddit ran on memes about billionaires packing up for Florida, alongside news threads on Brin’s spending. YouTube carried long explainers and commentary, much of it from progressive channels and Robert Reich. Instagram was Mark Ruffalo’s stage: one post drew more than 166,000 interactions. On Threads, voters asked each other how to vote on Props 40, 41 and 42.
Five moves before Nov 3
For campaigns and communicators, on either side: explain the ballot math between Props 40 and 42, answer the one-time question directly, don’t mistake reach for persuasion, watch Democrats and independents, and remember that the flight story cuts both ways.
Coming next
How to read a signal
A signal is not a poll. Online share is not vote share, and we set every finding beside public polling. Ballot Signals takes no side on any measure. What a signal can show is which arguments are gaining, how people feel about them, and who is carrying them.
Want this read on your issue? Send us a topic and we’ll show you what Rolli IQ finds. Talk to Rolli →
Method and how sure we are. Rolli IQ, public posts from Sep 1 to Oct 29, 2026, in two-week windows, across X, Reddit, YouTube, Threads, Instagram and Facebook. Bluesky was searched and returned no matching posts. Facebook returned posts from Oct 21 on only. Threads posts were filtered by hand and used for examples, not for shares. Storyline shares cover the most-engaged on-topic posts each search returned, coded into five storylines; memes and voter guides are excluded from storyline shares. Yes and No shares of X engagement code each top post by the side it supports. Emotion labels are Rolli IQ’s own, on the most-engaged X posts; Yes and No emotion shares exclude posts with no emotion detected. These are the most-engaged public posts, not a sample of voters. Polls: PPIC Statewide Survey (Sep 4–10 and Oct 16–22, 2026), Citrin Center/POLITICO (Sep 8–14), Berkeley IGS (Sep 15–20) and Berkeley IGS/LA Times (Oct 19–25). Campaign money: California Secretary of State, Prop 40 committees through Oct 22. Private individuals are described, not named.
