“So I’ve learned that fully self-funded candidates, meaning those who don’t supplement with financial support from others, typically lose. Self-funding on its own is not as valuable as getting money from others, and in particular large-dollar donations from others.

“The average for non-incumbent successful candidates in open seat primaries is about three to $400,000 in the first quarter. And if you look at incumbents who lost or struggled, well, their challengers for the most part, are not, you know, broke jokes. They’re raising $200,000 to $300,000 in their first quarter, which resembles what quote unquote “open seat candidates” are raising too in many districts. Maybe not your super wealthy districts like in New York or in California, but in many districts, $300,000 in your first quarter is a really good showing. So I would say money is money, and early money in particular is a prerequisite.

“Among those who run, rich candidates are also more likely to win.

“And what we show is that rich candidates are more likely to raise early money. In particular, they’re more likely to raise large-dollar donations, which then have a greater return in subsequent quarters.

“I’ve recently begun to look at this. With a graduate student of mine, Ryan Mundy, we collected data and wrote a paper on why wealthy candidates are likely to win. Because it’s not just the case that rich candidates are more likely to run, which most people know and prior research has shown, but among those who run, rich candidates are also more likely to win.

“I think that people forget how low information these contests usually are. Many primary voters really don’t know much about candidates. I think in the Michigan Senate example, that was less true. Money isn’t irrelevant, but when you have other pieces of information, that can override money. And furthermore, in that case, both of the candidates were spending millions of dollars in the primary. I mean, this is just so unique in a lot of ways.

“And that’s not going to mean that if you raise a lot of money, you definitely will win. That’s never been the case and that’s still not the case. But it does matter for you, it matters for who is seen to be seriously in the mix, who is perceived to be relevant. And in this cycle, just like in most cycles, virtually all contenders who are either successful or are seen as successful show support through early fundraising.

“The bulk of my research is looking at US House primaries, and I think you could probably draw similar conclusions for Senate primaries, except that in most cases, Senate primaries have way more information. So in the case of Michigan, I think people knew largely what the choices were. And after you get to that stage, largely through money and advertising and voter outreach, and campaigning, after that point, money might matter less because voters become more familiar with choices. But this is a really steep hurdle in most congressional primaries.