National elections in the United States are not decided by a sweeping national mood or a single wave of public opinion. They are decided by a few hundred thousand people in a handful of states, where the difference between winning and losing often comes down to fractions of a percentage point. This reality shapes everything about how campaigns operate, how parties choose their messages, and why the loudest ideological battles often have little to do with the actual outcome.
What political science says about how voters decide starts with a blunt finding: voters do not think in left and right. Decades of research, beginning with the work of Philip Converse and continuing with scholars like Donald Kinder and Nathan Kalmoe, show that only a small slice of the electorate reasons ideologically. Converse found about one voter in nine reasons ideologically, and that share has barely moved since. More recent estimates put the figure at 10 to 15 percent. Most people do not carry a coherent set of policy positions that they match to candidates like an entree off a menu. Instead, they rely on shortcuts: party identity, group affiliation, and feelings about which side seems to understand their lives.
That is why the concept of swing voters is central to understanding elections, even though the term is often misused. Swing voters are not necessarily moderates. They are not people who carefully weigh competing tax plans. They are, more accurately, persuadable voters — people whose attachment to a party is weak enough that events, personalities, or local conditions can tip them. They are less ideological than they are attentive to things like the economy, crime, or whether the incumbent seems competent.
Campaigns, however, often act as if voters are deeply ideological. This is what G. Elliott Morris named the Strategist’s Fallacy in October 2025: the belief that voters hold positions and match them to candidates like an entree off a menu. The fallacy leads strategists to chase the median voter with carefully calibrated policy positions, when in fact most voters are not paying that kind of attention. The evidence for this is stark. Across 49 field experiments, Kalla and Broockman’s best estimate of campaign persuasion is near zero persuasion in a general election is zero. That does not mean ads and rallies do nothing; it means they do not move many votes. What they do is reinforce existing loyalties and, crucially, turn out the base.
This brings us to the moderation debate. There is a persistent argument that Democrats lose because they are too progressive, or that Republicans lose because they are too conservative. The research complicates that story. Broockman and Skovron found legislators in both parties overestimate how conservative their constituents are. That suggests elected officials are not simply responding to a rightward public; they are responding to a misperception of it. Meanwhile, the small share of true ideologues is split between the left and the right, so chasing them with purity tests rarely helps in a general election.
The real action is in the fundamentals. Morris’s two-input fundamentals model — based on economic conditions and presidential approval — forecast Harris at about 48 percent of the two-party vote in 2024; she got 49.3 percent. On conditions alone, Trump wins about nine times in ten. The three decisive states turned on 229,766 votes. That is not a mandate for any ideology. It is a reminder that national elections are decided by the margins in a few places, where the same small group of persuadable voters can swing because of a bad harvest, a local scandal, or a debate stumble.
This is why the recent debate over Democratic strategy matters less than it appears. WelcomePAC’s report Deciding to Win recommends a 2028 Democratic nominee willing to break with progressive advocacy groups. That is a strategic suggestion, but it rests on a questionable assumption: that breaking with the left will attract swing voters. The research suggests swing voters are not listening to the left-right argument at all. They are listening for signals of competence, safety, and whether they feel recognized. The Strategist’s Fallacy is to think the answer is a better menu. The truth is that most voters are not reading the menu — they are just looking for a seat at the table.
