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At a glance

Overview

The 1958 Class II Senate cycle produced a decisive Democratic advantage, with the Democratic Party winning 25 of the 33 contested seats while the Farmer‑Labor Party captured the remaining 8. Despite a net loss of two Democratic seats among the contests, the chamber remained firmly under Democratic control, and the popular vote was essentially split—15,975,130 votes for Democrats versus 14,917,150 for Farmer‑Laborists.

The Map

The gain/loss map shows four partisan flips out of 33 races. Two states—Oregon and Massachusetts—shifted from Democratic to Farmer‑Labor control, while Wyoming moved the opposite way, flipping from Farmer‑Labor to Democratic. Texas also joined the list of gains, turning a Democratic seat into a Farmer‑Labor stronghold. Aside from these four changes, every other result was a hold, underscoring a largely static geographic landscape with only limited party movement.

The Balance

The post‑election seat balance is 25 Democratic seats to 8 Farmer‑Labor seats. This 3‑to‑1 ratio translates to a commanding Democratic majority in the Class II cohort, leaving the Farmer‑Labor Party with a modest minority bloc. The lopsided distribution means that legislative agendas will be set overwhelmingly by Democratic senators, with Farmer‑Labor influence confined to a handful of swing votes.

Closest on the Board

Illinois delivered the tightest contest. Democrat Jamal Lawrence edged Farmer‑Labor challenger Daniel Ferguson by a razor‑thin 1.72 percentage points, earning 50.86 % of the vote (1,709,100 votes) to Ferguson’s 49.14 % (1,651,199 votes). The race’s vote‑share‑over‑time line tells a dramatic comeback story: early returns at turn 288 showed Ferguson leading 56.1 % to Lawrence’s 43.9 %. By turn 292 the gap had closed to a virtual tie (50.1 % vs 49.9 %). Lawrence then surged ahead, briefly dipping below 50 % at turn 313 (49.7 % vs 50.3 % for Ferguson) before pulling back into the lead for the remainder of the count, finishing at 50.6 % to 49.4 % at turn 336. The chart’s jagged shape captures the back‑and‑forth nature of the contest, illustrating how Lawrence’s late‑stage gains secured the victory.

Races to Watch

Three other contests fell within the single‑digit margin band. In Alaska, Farmer‑Labor newcomer Sharon Werner won with a 5.27 % margin, marking the only “no‑prior” seat in the cycle and highlighting a competitive frontier. Colorado’s Maria Gallo held the seat for Farmer‑Labor by 6.16 %, while Michigan’s Stephanie King delivered a 6.36 % Democratic win. Each of these races featured margins under 7 %, suggesting that while the overall map was dominated by holds, pockets of volatility existed in the West and the Great Lakes region.

Results by state