ExpressVote XL, Philly's first new voting machines since 2002. Photo: Matt Rourke/AP

The majority of 10,000 election jurisdictions nationwide use Windows 7 or an older operating system for voting or tallying — archaic systems vulnerable to hackers, AP reports.

Why it matters: Private vendors, and state finances, determine the security level of election systems, which lack federal requirements or oversight.

What they're saying: J. Alex Halderman, a University of Michigan professor and election security expert, said the country risks repeating "mistakes that we made over the last ... decade-and-a-half when states bought voting machines but didn't keep the software up-to-date."

What's next: Windows 7 reaches its "end of life" Jan. 14, meaning Microsoft stops technical support and patches, although security updates will be provided for a fee through 2023.

  • AP's 50-state survey found that battleground states using Windows 7 include Pennsylvania, Wisconsin, Florida, Iowa, Indiana, Arizona and North Carolina.

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Biden has huge cash advantage over Trump as Election Day nears

Democratic presidential nominee Joe Biden in Wilmington, Delaware, on Monday. Photo: Drew Angerer/Getty Images

Democratic presidential nominee Joe Biden had $177.3 million in the bank at the end of September, per the latest Federal Election Commission filings.

Why it matters: President Trump's re-election campaign reported having $63.1 million in the bank at the end of last month, as campaigning enters the final stretch ahead of Election Day on Nov. 3.

Court allows North Carolina mail-in ballots deadline extension

An absentee ballot election worker stuffs ballot applications at the Mecklenburg County Board of Elections office in Charlotte, North Carolina, in September. Photo: Logan Cyrus/AFP via Getty Images

North Carolina can accept absentee ballots that are postmarked Nov. 3, Election Day, until Nov. 12, a federal appeals court decided Tuesday in a 12-3 majority ruling.

Why it matters: The 4th Circuit Court of Appeals' ruling against state and national Republican leaders settles a lawsuit brought by a group representing retirees, and it could see scores of additional votes counted in the key battleground state.