2024 election updates: Trump and Harris bring their campaigns to the battleground state of Wisconsin

A set of state polls by CNN and SSRS released Tuesday found Trump and Harris to be effectively tied among likely voters in Arizona and Nevada.

The Democratic Senate candidates, meanwhile, comfortably lead in each state.

In the Senate race in Arizona, Democratic Rep. Ruben Gallego faces Republican Kari Lake. Lake is a Trump ally who was one of the most vocal election deniers after the 2020 election, refusing to concede that Trump had lost the presidential election and that she had lost her governor's race.

In Nevada, Democratic incumbent Jacky Rosen races Republican candidate Sam Brown.

A federal judge in Pennsylvania dismissed a lawsuit Tuesday brought by five GOP congressmen who sought to segregate absentee ballots from overseas voters, including military members and their families.

MORE | Judge tosses Republican congressmen's lawsuit over Pennsylvania's overseas and military votes

They asked that the overseas ballots be segregated to ensure their validity.

Pennsylvania election law only permits ballots to be sent overseas if the applicant is eligible and the office has rarely seen any misuse, representatives from the Pennsylvania Secretary of State argued.

U.S. District Judge Christopher C. Conner sided with the secretary of state's office in his 21-page decision.

"Plaintiffs delayed too long to file their action, they lack standing, they have failed to join indispensable parties, and they have failed to articulate a viable cause of action," he said.

Similar lawsuits filed by the Republican National Committee in Michigan and North Carolina were dismissed by local courts. The plaintiffs have vowed to appeal.

The U.S. Postal Service issued an alert to voters who are planning to mail an absentee ballot and urged them to send them through the mail on Tuesday.

Although the USPS said it is "ready to successfully deliver the nation's mail-in ballots for voters who choose to use us to vote," it is anticipating an uptick of ballots in the mail over the coming days.

"We continue to recommend that it is a good common-sense measure for voters who choose to mail in their ballots to do so before Election Day and at least a week before their election office needs to receive them. If a ballot is due on Election Day, the Postal Service recommends mailing the ballot by this Tuesday (October 29)," the agency said in a news release.

The USPS said 99.9% of ballots were delivered within a week in 2020 and 98.3% of ballots were delivered within three days.

The USPS said it has undertaken "extraordinary measures" that it has taken in past elections, including extra deliveries and collections, special pickups, specialized sort plans at processing facilities to expedite delivery to boards of elections, and local handling and transportation of ballots.

Bill Nye "The Science Guy" encouraged Philadelphia residents to vote in this year's election.

Bill Nye The Science Guy encourages Philadelphians to vote and discussed why climate is on the ballot during a visit to Philadelphia.

He spoke at a "Party to the Polls Purple Tour" on Tuesday morning.

The educator discussed why climate is on the ballot and how this year's presidential race could impact the future of climate change.