National Assembly Data Analysis: PPP Party Unity Recovers to 99.1%

The People Power Party's (PPP) unity rate, which had fallen to 95.4% in August, rebounded to 99.1% in just one month.

A reconstruction of publicly available National Assembly roll-call data by lawmaker and by month revealed that the two major parties' track records on following party positions (unity rates) diverged markedly over time. The Democratic Party of Korea (DPK) sustained near-perfect cohesion for all five months, hovering between 99.9% and 100.0%. The Rebuilding Korea Party and independent lawmakers also recorded figures close to 100% in most months. This analysis is notable in that it is based on quantitative data drawn from bill sponsorship and voting records, confirming points where reality diverges from the parties' widely held public images.

DPK's Wall-Like Solidarity Confirmed in Numbers

The DPK's unity rate stood at 99.9% in May 2026, 100.0% in June and July, and 99.9% each in August and September. Over five months, the gap between its lowest and highest figures was a mere 0.1 percentage points. This is interpreted as a direct numerical reflection of the structural demands placed on the majority party in the chamber, which must minimize internal defections to steer bill processing. It demonstrates that a strong floor leadership system is at work, tolerating not even minor defections as the majority party pushes through its positions.

The Rebuilding Korea Party's trajectory is also interesting. Although stray votes briefly appeared in June (97.9%) and August (98.5%), the entire membership followed party lines in the remaining months. For a minor party with around 10 seats, the defection of just a few members can send the unity index swinging sharply. Even so, maintaining perfect alignment for most of the period suggests the party leadership's control exceeds its size.

The PPP's Fluctuating Unity: What Happened in August?

The PPP started at 99.5% in May, then declined for three consecutive months to 98.4% in June, 97.6% in July, and 95.4% in August. The August figure represented a gap of 4.5 percentage points with the DPK over the same period. However, in September it rebounded to 99.1%, narrowing the gap back to 0.8 percentage points. As an opposition party, the PPP's unity rate is bound to fluctuate when members repeatedly withhold strategic support on bills or partially defect, and the three-month slide suggests that reaching consensus within the party over contentious bills was no easy task.

An interesting contrast comes from the independent lawmakers. Despite being free of any party-line constraints, independents showed a consistent voting pattern across the board except in June (97.5%). This indicates that independents maintained voting trajectories relatively similar to those of a particular camp, suggesting they may not have fully escaped the sphere of influence of the negotiating bloc they once belonged to, even after leaving. That said, the cause cannot be definitively determined from voting data alone.

What Unity Numbers Don't Tell Us

A high unity rate does not guarantee intra-party democracy or policy quality. If anything, the figures tend to rise the stronger the floor leadership's control, so near-100% numbers can also be read as a signal of an environment where the possibility of defection is blocked at the source. The PPP's fluctuations may be less evidence of infighting than the result of a relatively open structure in which individual lawmakers' convictions are exposed through votes on issue-by-issue legislation.

This analysis also carries the clear limitation of resting solely on observable behavior in the form of voting records. Sponsorship and voting are only part of a lawmaker's activities, and differences that emerge in committee review or intra-party deliberation do not show up in the numbers. Even so, the pattern revealed by five months of data is clear: the DPK's unified voting, the PPP's fluctuations, and the independents' exceptional defections. With the budget season approaching, whether the PPP sustains its September recovery or slips back into decline will be the next point of focus for gauging the balance of power in the chamber.