Top Democrats believe that their massive ground game and high level of coordination in the final weeks of the campaign will propel their candidates to victory in the House, Senate and White House.

The chairs of the Democratic National Committee, Democratic Senatorial Campaign Committee and Democratic Congressional Campaign Committee touted the coordinated efforts among the three organizations, particularly in battleground states, in a call with reporters on Friday.

DNC Chair Jaime Harrison said that Democrats have an extensive ground operation in battleground states, which included 312 coordinated offices and more than 2,000 coordinated staff.

---

---

“Everywhere Democrats are on the ballot this November, from the school board to the White House, we are fighting to win,” he said.

Rep. Suzan DelBene, chair of the DCCC, said Democrats have the financial edge over Republicans in House races. Democrats have consistently outraised the GOP this election cycle, piling up $250.6 million compared with the Republicans’ $183 million.

Democrats need to flip only a handful of seats to win the lower chamber, and they have their sights set on New York, where a small wave of Republican victories propelled the GOP to the majority in the House in 2022, and in California.

Ms. DelBene, Washington Democrat, said the DCCC is also investing in Iowa and Alabama, two places that “don’t get much national attention.”

“But they illustrate how broad our map is, and our investment in these states reflects how confident we are in the role they will play in retaking the House majority,” she said.

But their confidence in the waning weeks of the campaign comes as signs of trouble loom for Democrats’ chances of holding onto the Senate. Republicans have gained ground in Montana in the race between Democratic Sen. Jon Tester and Republican candidate Tim Sheehy, which has been considered the key to winning the Senate.

Sen. Gary Peters of Michigan, chair of the DSCC, said he feels good about Democrats’ chances of keeping a Senate majority, and that close races in Montana and other key seats are “where we actually thought we would be at this moment.”

“When you’re in the margin of error, that means you win by putting in the most effort,” Mr. Peters said. “But whoever works the hardest over these next few days will win. Whoever is best organized will win. Whoever has the best candidate will win. We have all three of those areas.”

Democrats believe they have real pickup opportunities in the Texas and Florida Senate races, where Sen. Ted Cruz, Texas Republican, is in a tighter-than-expected race against Rep. Colin Allred, Texas Democrat, and Sen. Rick Scott, Florida Republican, is running against former lawmaker Debbie Mucarsel-Powell.

The DSCC has committed a multimillion-dollar investment in both states, but has so far not stated how much it plans to spend in the Republican strongholds.

Both Republican candidates have a roughly 5-point lead over their Democratic challengers, and Democrats are making a last-ditch effort to hold onto the Senate.

Mr. Peters said that Mr. Cruz and Mr. Scott barely eked out wins in their previous contests, and believed that their waning popularity over support of abortion restrictions would prove enough to cause voters to send them home.

“We’re confident we can keep that momentum going as long as we have the resources, and we’re working hard to make that happen,” he said.