The Justice Department in recent days has continued moving at an aggressive clip in ramping up its criminal investigation into the Alaska U.S. Senate race, sources familiar with the matter tell ABC News, with prosecutors now in the process of issuing more than 100 subpoenas and at least twenty letters alerting individuals that they are targets of the probe.

The investigation began accelerating last week after The New York Times detailed alleged efforts by Democrats and some in Democratic candidate Mary Peltola's campaign to recruit Daniel J. Sullivan, a retired teacher, to be on the ballot with incumbent Republican Dan S. Sullivan.

The target letters are being issued to Democrats whom investigators believe were involved in the recruitment effort.

A DOJ spokesperson did not immediately respond to a request for comment from ABC News.

-ABC News' Pierre Thomas, Alexander Mallin, Luke Barr and Katherine Faulders

Democratic Senate candidate Troy Jackson attended a canvass launch in Portland, Maine, telling supporters that Tuesday's election is not just about the Senate, but is about the people of Maine.

“I mean, you all know it, and I talk about this all the time. You know, I always enjoy the team sports, and this is the ultimate team sport right now, and so this is not, you know, about U.S. Senate. This is about all of us in this race,” Jackson said.

“We are going to be able to do some really great things if we pull this off in these next seven-and-a-half hours,” he said.

Jackson was asked if he’s nervous about how he will perform in some of the counties that voted Democratic for the presidential race and Republican in the Senate race, as seen in the 2020 election, which saw former President Joe Biden win Maine but also saw GOP Sen. Susan Collins win reelection.

“Well, as far as nervous goes, I mean, I don't know how many elections I've been in, but I was nervous in every one of them, and one of them I was unopposed. If you're going to do this work, you should be nervous. I mean … it should matter to you that you know people are giving you, trusting you with your vote,” Jackson said.

-ABC News’ Hannah Demissie

Héctor Sánchez Barba, the president and CEO of Mi Familia Vota, told ABC News Live anchor Kyra Phillips that Latinos have emerged as a critical voting bloc this election.

After speaking to voters in the Rio Grande Valley this week, Barba said that "Latinos are turning out to vote in historical numbers."

"We are rejecting MAGA. We are tired of extremism. We are tired of the hate crimes. We are tired of the situation of the economy. We are tired of exclusion," he said.

Barba, who said he plans to watch election results with Texas U.S. Rep. James Talarico tonight, who is the Democratic nominee for U.S. Senate, he stated that he believes that there is an "alignment" between the demands of Latino voters and Talarico’s campaign.

"He knows what it means to be working class, and he understands the Latino community from that perspective. That's why we're making sure that we support candidates that are welcoming to Latinos, that are respectful to Latinos, but also that Latinos are at the center of making the decisions and are at the center of the table," he said.

-ABC News’ Synai Ferrell

According to an analysis of advertising spending from AdImpact, of the ten most expensive gubernatorial races in U.S. history, eight were held this election cycle.

The most expensive is the California gubernatorial race, which saw roughly $350.3 million expended. That race has Democrat Xavier Becerra, the former U.S. secretary of health and human services, facing off against Republican Steve Hilton, who has worked as a contributor for Fox News. Tom Steyer, a liberal billionaire, spent over $215 million of his own money trying to make it into the general election.

Of the ten most expensive House races on record, nine are from the current cycle. The most expensive is the race for Michigan's seventh district, which has Democratic candidate Will Lawrence, co-founder of the Sunrise Movement environmental group, up against Republican incumbent Rep. Tom Barrett. AdImpact says over $66 million has been spent on the race for Michigan's seventh district.

Three U.S. Senate races from this cycle broke into the top ten most expensive of all time: Texas, Ohio and Michigan.

According to AdImpact, the Texas race has cost about $594.1 million, Ohio cost about $525.5 million, and Michigan cost about $382.1 million.

-ABC News’ Will Lennon

Rep. Suzan DelBene, D-Wash., the chair of the Democratic Congressional Campaign Committee tasked with retaking the House, tells ABC News she is "confident" but "ready for anything" this Election Day.

"I am confident we will take back the majority, but I am going to have my radar up," she told ABC News in a phone interview Tuesday morning.

"My mantra is 'be ready for anything' this entire cycle, and we are going to be ready today and after the election again to make sure every legal vote is counted," she said, pointing to the Trump administration's election-related lawsuits around mail-in ballots and threats made against local election officials.

DelBene said she will be watching House races in Virginia and Kentucky early in the night to see what to expect across the country and predicted that GOP redistricting efforts would hurt the Republican Party.

"I think we're going to see the impact of that backfiring in places like Texas 28 with Henry Cuellar," she said. "I also look at Ohio 9 and Marcy Kaptur, or Florida 14 with Kathy Castor or Don Davis in North Carolina [1st district]. I think that not only will this show that these efforts have backfired, but I would also say that this should be a warning to Republicans if they go down this path again in 2028."

-ABC News' Ben Siegel