Voters in Virginia head to the polls on Tuesday to decide on a measure that could redraw the state’s congressional map and potentially shift the balance of power in Washington.

Major political figures, including former President Barack Obama and House of Representatives Speaker Mike Johnson, have weighed in on the high-stakes vote, with nearly $100m spent on campaigning around it.

Part of a broader redistricting battle that began in Texas and spread nationwide, the vote may be the Democrats’ last chance this year to gain seats by changing district maps. The vote comes about six months before the 2026 midterm elections.

Here is what we know:

What is Virginia voting on?

Virginia currently sends 11 members to the House. At the moment, six of them are Democrats, and five are Republicans, reflecting the state’s balance.

Democrats now want to redraw the map to favour them in a way that could help them win up to 10 of the 11 seats. Under the proposal, most districts would be safely Democratic or lean towards the party, with only one strongly Republican.

A breakdown would be:

• Eight districts would be safely Democratic
• Two would be competitive but lean Democratic
• Only one would be safely Republican

If approved, this could give the Democrats several extra seats in Congress, helping them win back or strengthen control of the House in Washington, where majorities are often decided by just a few seats.

That would be a big political shift for the state, which was once closely contested but has become more Democratic-leaning in recent years.

How would the vote work?

Voters in Virginia can cast their ballots either early or on Election Day.

Polling stations will be open across the state on Tuesday:

• Polls open at 10:00 GMT
• Polls close at 23:00 GMT

Votes will be counted after polls close, with early results expected later that evening and fuller results overnight or the next day.

What are voters being asked to decide?

The proposed constitutional amendment is the only statewide contest on the ballot.

It reads:

“Should the Constitution of Virginia be amended to allow the General Assembly to temporarily adopt new congressional districts to restore fairness in the upcoming elections, while ensuring Virginia’s standard redistricting process resumes for all future redistricting after the 2030 census?”

A “yes” vote would support allowing the General Assembly to redraw congressional districts before the midterms.

A “no” vote would leave current boundaries unchanged until the next round of regularly scheduled redistricting after the 2030 census.

What do the latest polls suggest?

The result is expected to be close.

A recent poll by State Navigate, a nonpartisan research group, suggests a small lead for supporters, with about 53 percent in favour and 47 percent against.

Why do district lines matter so much?

District lines decide how voters are grouped, which can shape who wins elections.

Moving the lines can make a district more favourable to a Democratic or Republican win, by adding or removing neighbourhoods and communities that lean one way or the other.

It can turn a close race into a safe seat, or the other way around. It affects which communities are kept together and who represents them.

This process, often called gerrymandering, allows parties to draw maps that benefit them.

In a closely divided state like Virginia, even small changes to the map can shift several seats and influence who holds power in Congress.

A 2023 study by Harvard University researchers found that gerrymandering often creates “safe” seats for politicians, meaning their races are less competitive.

In turn, those politicians become less responsive to the needs of their constituents, who become discouraged about voting as a result.

When could new maps take effect?

If approved, the new map could be used as early as the next election cycle, including the upcoming midterms, depending on legal approval.

However, the plan could face legal challenges. Critics have questioned the ballot wording and the process used by lawmakers.

The Virginia Supreme Court has allowed the vote to go ahead while reviewing those concerns.

If it later finds that rules were broken, the results could be overturned, and the current maps would remain.

Why this vote could shape power in Washington?

A handful of seats could decide control of the US House.

Republicans currently hold a narrow 218–213 majority, but Democrats are seen as competitive heading into the midterms.

Political leaders have underscored the stakes.

Hakeem Jeffries, the Democratic Party’s leader in the House, has pointed to Virginia as a crucial battleground, while Mike Johnson has said the result will be closely watched across the country.

What it means to control the US House

The party with the majority (more seats) in Congress can:

• Set the agenda, deciding which bills are brought up for debate
• Control committees, including investigations and hearings
• Pass legislation more easily (if they stay united)
• Block bills from the minority party.

The majority party also chooses the speaker of the House, who has major influence over what reaches the floor.

Where else has this happened?

Virginia’s redistricting vote is part of a larger political battle playing out in the US. Republicans in Texas, encouraged by Donald Trump, have redrawn district maps to strengthen their advantage, prompting similar efforts in other states.

In rare cases, voters have been asked to decide directly, including in California last year and now in Virginia.

In California, voters backed the changes despite concerns about fairness. Now it’s Virginia’s turn to decide.

What Democrats are saying, and why?

Democrats argue the plan is a response to Republican actions in other states, not just a power grab.

Leaders like Obama had long opposed gerrymandering in principle, but have now backed the Virginia move, even releasing a video asking voters to go out and vote for the constitutional amendment.