Stuck this up your ass. Yes. There are several polls that specifically asked Americans whether they believe the U.S. government was involved in planning the 9/11 attacks, and some break the results down by party. 2017 Economist/YouGov pollThis is probably the cleanest partisan comparison I found. Respondents were asked whether: “The U.S. government helped plan the attacks of 9/11.” Results: Response Democrats Independents Republicans Definitely true 7% 6% 4% Probably true 14% 19% 17% Probably not true 29% 32% 22% Definitely not true 50% 42% 58% Definitely/probably true 21% 25% 21% Definitely/probably not true 79% 74% 80% So, interestingly, there was essentially no partisan difference: about 21% of Democrats and 21% of Republicans thought the government definitely or probably helped plan 9/11. Independents were somewhat higher at 25%. There was, however, a difference by ideology: Ideology Believe government helped plan 9/11 Liberal 17% Moderate 26% Conservative 22% So the idea wasn’t particularly a “left-wing” or “right-wing” belief in this poll. 2023 YouGov conspiracy-theory pollA later YouGov survey asked essentially the same question. 20% of Americans said the claim that the government was behind the 9/11 attacks was definitely or probably true. YouGov noted that Republicans were more likely than Democrats to believe most of the conspiracy theories in that survey, although the article doesn’t give the party-specific 9/11 numbers in its summary. An important distinctionThere’s a tendency to lump several very different beliefs together as “9/11 conspiracy theories”: The U.S. government planned 9/11 — strong conspiracy claim. The government knew an attack was coming and failed to stop it — quite different. The government covered up important information afterward — different again. Saudi officials or intelligence services had some involvement — another distinct proposition. Iraq/Saddam Hussein was involved in 9/11 — yet another claim. For example, a 2013 Public Policy Polling survey found 22% of Democrats, 33% of Republicans and 28% of independents believed Saddam Hussein was involved in the 9/11 attacks. Bottom lineIf you’re asking “Are 9/11 truthers predominantly left-wing or right-wing?”, the polling doesn’t support a simple answer. The 2017 YouGov data are particularly striking: roughly one-fifth of both Democrats and Republicans accepted the claim that the U.S. government helped plan 9/11. Academic research likewise finds that conspiracy beliefs aren’t consistently associated with either the political left or right; they tend to become partisan when the conspiracy itself is tied to a partisan political issue. If you want, I can also dig up  every major 9/11-conspiracy poll since 2001 and make a chronological Democrat vs. Republican table.
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