Sen. Maria Cantwell at the U.S. Capitol in January. Photo: Chip Somodevilla/Getty Images

A staffer in the Washington, D.C., office of Sen. Maria Cantwell (D-Wash.) is in insolation after displaying symptoms of the novel coronavirus for which they subsequently tested positive, a statement released Wednesday night confirms. The office is now serving constituents remotely.

Why it matters: This is the first known case of a congressional staffer becoming infected with the virus. "The individual who tested positive for COVID-19 has had no known contact with the senator or other members of Congress," the statement notes. "The senator is requesting that testing be done on any other staffers who have been in contact with the individual and show symptoms."

Go deeper: Lawmakers self-quarantine after contact with confirmed coronavirus cases

Editor's note: This article has been updated with more details on the case.

Go deeper

New interactive tool shows Biden's mail voting danger

Data: SurveyMonkey; Chart: Danielle Alberti/Axios

Voters who disapprove of President Trump most strongly are by far the most likely to vote by mail in the presidential election, according to an Axios analysis of exclusive data from SurveyMonkey and Tableau.

Why it matters: The new data shows just how strongly the mail-in vote is likely to favor Joe Biden — with potentially enormous implications in the swing states due to the greater risk of rejection with mail ballots.

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Reopening the ACA debate is politically risky for GOP

Data: Kaiser Family Foundation, The Cook Political Report; Notes: Those losing insurance includes 2020 ACA marketplace enrollment and 2019 Medicaid expansion enrollment among newly-eligible enrollees. Close races are those defined as "Toss up" or "Lean R/D"; Table: Andrew Witherspoon/Axios

The sudden uncertainty surrounding the future of the Affordable Care Act could be an enormous political liability for Republicans in key states come November.

Between the lines: Millions of people in crucial presidential and Senate battlegrounds would lose their health care coverage if the Supreme Court strikes down the law, as the Trump administration is urging it to.

Coronavirus cases rise in 22 states

Expand chart
Data: The COVID Tracking Project, state health departments; Map: Andrew Witherspoon, Sara Wise/Axios

The coronavirus is surging once again across the U.S., with cases rising in 22 states over the past week.

The big picture: There isn't one big event or sudden occurrence that explains this increase. We simply have never done a very good job containing the virus, despite losing 200,000 lives in just the past six months, and this is what that persistent failure looks like.

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