The Democratic Congressional Campaign Committee has apparently decided that embracing the “Blue Dog Democrats” – a group of politicians who proudly tout their commitment “to pursuing fiscally-responsible policies, ensuring a strong national defense, and transcending party lines” – is the prudent electoral strategy for the Democratic Party in 2018. Daily Beast contributor Michael Tomasky agrees, writing that the “reality, which many liberals refuse to accept[, is that to win a majority in the House of Representatives], Democrats have to win in 20 to 25 purple districts. And that means electing some moderates.”

If you’re in favor of Democrats joining with Republicans to enact tax cuts that go mostly to the rich, reductions in government spending on support for low- and middle-income people, and more legislation authorizing perpetual war, this strategy isn’t totally crazy. But if you’re in favor of “single-payer health care, a much higher minimum wage, a massive infrastructure program, a top marginal…tax rate around 50 percent, a much higher payroll tax cap, and more,” which Tomasky says he is, this strategy couldn’t be more wrong. Even if it led to a Democratic House, it would stymie your agenda. In New York, for example, while the Blue-Dog-esque Independent Democratic Conference (IDC) gives Democrats a nominal majority in the state Senate, the IDC consistently partners with Republicans to undermine economic and social justice. A Democratic majority doesn’t help you very much if the Democrats who get you there don’t share your values.

Importantly, there’s also no reason to believe Tomasky’s assertion that “moderate” candidates will improve Democrats’ electoral prospects. In fact, evidence suggests an alternate strategy holds more promise in contested (or even heavily Republican) districts in 2018.

Consider recent special elections to replace Trump appointees Mick Mulvaney (South Carolina’s 5th District), Mike Pompeo (Kansas’ 4th District), Tom Price (Georgia’s 6th District), and Ryan Zinke (Montana’s At-Large seat) in the House. Democrats pursued the Tomasky strategy (or, as former Hillary Clinton press secretary Brian Fallon seems to call it, the “Panera Breads of America” strategy) in Georgia, spending a historical record $30 million on a candidate, Jon Ossoff, who stressed deficit reduction and actively opposed both single-payer health care and taxing the rich. The national party apparatus mostly stayed out of the other three races, but the Democratic candidates in Kansas (James Thompson) and Montana (Rob Quist) secured progressive endorsements with a platform closer to the one Tomasky theoretically supports. Nobody paid much attention to Archie Parnell, the Democratic candidate in South Carolina, who, like Ossoff, would fit in pretty well with the Blue Dogs.

The Democrats lost all four races. But based on how Democrats had fared in each of those districts historically, they also significantly outperformed expectations. All of them except for Ossoff, that is, who did far better than the practically nonexistent candidate Democrats ran in the prior congressional election in Georgia’s 6th District but worse than Hillary Clinton performed there against Donald Trump. Note also that Georgia’s 6th District is more affluent than most and thus, according to Tomasky, a place in which “the Democrat should definitely talk more about growth than fairness but can probably get away with somewhat more liberal social positions,” which basically describes how Ossoff ran his campaign. In other words, the Democratic Party invested the most resources and got the least return on one of the “moderate” special election candidates in a district tailor-made for the Tomasky strategy.

Advocacy for single-payer health care didn’t put Thompson and Quist over the top in their races, of course, and Parnell, a “moderate” who both the party and grassroots organizers more or less ignored, came the closest to victory. These special elections certainly don’t prove that endorsing economic justice more will win. But they do show it can play better than a Republican-lite economic platform in heavily Republican areas, a fact also underscored by the recent results of state special elections. In New York’s 9th Assembly District, for instance, which Trump won with 60 percent of the vote, bold progressive Christine Pellegrino just trounced her Republican challenger en route to a seat on the state assembly.

Then there’s the recent international evidence. Jeremy Corbyn just helped the United Kingdom’s Labour Party pull off its biggest electoral swing in seventy years, defying pundit predictions of Labour’s imminent trampling from a few months before. Some of Labour’s surge was likely due to the Conservative Party’s mistakes, but some of it was also likely due to a bold set of economic ideas Labour outlined in a new manifesto, ideas that couldn’t be more different from those the Blue Dog Democrats embrace. Labour’s showing underscored what evidence had indicated since at least February of 2016, when I first pointed it out: Bernie Sanders was much more likely than Hillary Clinton to win a head-to-head matchup against a Republican presidential candidate that November. That evidence only got stronger as the primary season continued; many Democrats likely wish they had taken it more seriously. Today, Sanders – a politician about as far from the Blue Dogs as you can get in the Senate – remains the most popular politician in America. The claim that Sanders-style economic and social justice advocacy is unworkable in the critical purple districts Tomasky references doesn’t square with the absence of moderate Democrats more popular than Sanders in those districts.

And let’s not forget that the Democratic Party has been decimated in recent years. Not only have they lost control of the executive branch of the federal government and both chambers of Congress, they now also hold only 18 state houses, 15* governorships, and 13 state senates. They’ve been running moderate candidates in purple districts, and that strategy doesn’t seem to be working very well.

That doesn’t mean we can be certain about what will get Democrats elected. A candidate’s general election viability is ultimately unknowable. It may depend on her or her opponent’s platform, debating skill, fundraising prowess, personality, or field operation. It may hinge on the quirks of the community she’s running for office in or how much the media likes her. It may come down to random chance. Electability is also often a self-fulfilling prophecy; people commenting on electability and making decisions based on their perceptions of it can actually influence it and do so all the time.

The only thing we can be certain of in the electability space is political strategists’ and pundits’ poor track records. Many of the people who claim to know what is and isn’t possible in future elections thought Bernie Sanders would barely get 15 percent of the vote in the Democratic primary. Many of them were sure that Republicans would never nominate Donald Trump, and once that prediction turned out to be wrong, were still absolutely positive that Trump would never become president. It’s long past time we viewed their claims with skepticism, especially when there’s evidence that points the other way.

Good policy can sell. Voters can be persuaded. Political reality is not something that gets handed to us, but something we help create. Candidates with economic and social justice platforms can win in purple districts, and they’ll be even more likely to do so if Democratic pundits stop assuming they can’t and start getting behind them.

*Updated from 16 to 15 on August 5, 2017, after West Virginia Governor Jim Justice announced he would switch his party affiliation from Democrat to Republican. Thanks to Michael Sainato for the heads up!