(This is the 21st edition of our power rankings of Democrats most likely to get their party's presidential nomination in 2020.)

Why? Two reasons:

1) The top 12 candidates will gather in Ohio for the CNN-sponsored fourth debate.

2) Full fundraising reports for the third quarter -- all money spent, raised and left on-hand as of September 30 -- are due at the Federal Election Commission.

So, in a single day, we will have the chance to analyze the candidates against one another twice. Once on a debate stage and once in the money chase.

Which is a big deal, given that making the debates and raising money are perhaps the two biggest signs of momentum and support as the race begins to narrow from the bloated, 20+-person field of the summer.

They are also deeply intertwined. To make the debate stage you need to be able to show a broad spectrum of financial support (130,000 donors for this October debate, 165,000 for the November debate). But if you don't make the debate stage, it makes it that much harder to convince people you have a viable chance at the nomination and that people should invest in you.

Chicken, meet egg.

Below, the 10 candidates with the best chance of winding up as the Democratic nominee against President Donald Trump.

10. Tom Steyer: Money can get you a place at the political table. Steyer has : Money can get you a place at the political table. Steyer has spent many millions on television advertisements in the early states. That's gotten him enough support to make the October debate, and it has him on the cusp of making November's debate . Making debates means your candidacy has a pulse, which apparently many Democratic candidacies don't have. (Previous ranking: Unranked)

9. Amy Klobuchar: The Minnesota senator holds her spot on the list because there's just no one else who has any better case. The problem for Klobuchar is that she's been stuck in the bottom half of the bottom half of the top 10 for months now, and there's very little sign that she can change that reality. Klobuchar has tried all sorts of way to make the case that she should be the fallback pragmatist if Joe Biden falls away, but it looks like Pete Buttigieg has stepped into that slot. (Previous ranking: 9)

8. Andrew Yang: The second businessman on our list : The second businessman on our list just announced that he raised $10 million during the third quarter. That's likely going to be more than the vast majority of Democrats running. Yang's up to 3% in the national polls on average , which again puts him well ahead of most Democrats. He looks very likely to make the November debate, and his unconventional campaign has found a niche audience. (Previous ranking: 8)

7. Cory Booker: Booker's campaign insists that : Booker's campaign insists that his we-need-$1.7-million-or-else gambit at the end of last month wasn't just an elaborate fundraising ploy but rather a truly desperate, running-out-of-money move. So yes, Booker got to his $1.7 million goal, but he only raised $6 million total over the past three months. And no, that doesn't put him anywhere close to the cash totals of the top tier. (Previous ranking: 7)

6. Beto O'Rourke: There are real questions over whether O'Rourke should be this high on the list. We think his unconventional national campaign may find some audience, but right now it isn't. The biggest question going forward is whether O'Rourke will actually qualify for the November debates. He's only gotten one qualifying poll so far and needs three more. If O'Rourke continues to struggle, we'll move him down. (Previous ranking: 6)

5. Kamala Harris: The California senator stays in the top five solely because no one in the second five has stepped up at all -- maybe other than Yang? -- in the past few months. Harris is in : The California senator stays in the top five solely because no one in the second five has stepped up at all -- maybe other than Yang? -- in the past few months. Harris is in freefall in key state and national polls and her campaign is in the midst of a staff change near the top. As for her call on Twitter to ban President Trump? Flop City. (Previous ranking: 4)

4. Pete Buttigieg: Buttigieg is polling at about 10% in : Buttigieg is polling at about 10% in Iowa and New Hampshire . Additionally, he has the best very favorable rating in Iowa besides Warren, and his favorable-to-unfavorable rating in New Hampshire is also quite high . The issue for Buttigieg is simple: he has, so far, had little appeal to nonwhite voters. Even if Buttigieg can win in the very white states of Iowa or New Hampshire, his campaign may hit the skids afterward. (Previous ranking: 5)

3. Bernie Sanders: The Vermont senator is : The Vermont senator is off the campaign trail for the moment following the insertion of two stents in a blocked artery earlier this week. Sanders' third-quarter fundraising -- $25 million raised! -- sets him up well. The problem for Sanders is that his support has stagnated somewhat as Warren has begun to move past him, especially among liberals. (Previous ranking: 3)

2. Elizabeth Warren: You want to see a campaign where nearly everything seems to be going right? Feast your eyes on Warren's. She's either tied or slightly ahead Biden in Iowa, New Hampshire, and now even the national polls. Warren's favorable ratings are quite high, too. But Warren still has her flaws. She is : You want to see a campaign where nearly everything seems to be going right? Feast your eyes on Warren's. She's either tied or slightly ahead Biden in Iowa, New Hampshire, and now even the national polls. Warren's favorable ratings are quite high, too. But Warren still has her flaws. She is struggling mightily in South Carolina because of a lack of appeal to black voters, and a lot of her voters aren't certain of their choice . Still, Warren's had a really great third quarter of 2018. (Previous ranking: 2)