There is no reliable, objective answer—actual IQ scores for current US senators aren't publicly available or tested.

Claims about politicians' IQs are almost always partisan speculation, memes, or proxies based on gaffes, education, or public perception rather than real data. Studies on congressional intelligence (e.g., using educational attainment or cognitive proxies) show senators as a group are well above average—often with many in the top percentiles of cognitive ability—but no individual rankings by IQ exist.

What the evidence shows instead:

No verified IQ list: Viral social media posts and old "studies" claiming specific low scores (or an average senator IQ around 98) are unsubstantiated or satirical. Real estimates for Congress put averages much higher (typically 120+ range based on education and achievement).

Public perception polls: YouGov data shows people rate figures like Marjorie Taylor Greene low on perceived intelligence, but she's in the House, not the Senate.

Education as a rough proxy: Nearly all senators have bachelor's degrees; most have graduate degrees (law, etc.). The notable exception is Sen. Markwayne Mullin (R-OK), who has only an associate degree and has been noted as the least formally educated current senator.

Most frequently criticized:

Sen. Tommy Tuberville (R-AL, former college football coach) gets by far the most media and online attention as the "dumbest senator." Reasons include:

Famous gaffe struggling to name the three branches of government.

Prolonged hold on military promotions.

Multiple verbal slips and controversial statements (e.g., on white nationalism).

Repeated "dumbest senator" labels from outlets like The New Republic and columnists.

Bottom line: Without standardized testing, we can't name a "lowest IQ" senator. Tuberville or Mullin are the ones most often mocked on this metric, but it's largely political theater. Intelligence in politics is multifaceted and hard to rank.8

(http://www.autoadmit.com/thread.php?thread_id=5863927&forum_id=2).#49867304)