Where are the most expensive midterm races and who is funding them?

On Tuesday, voters across the United States will head to the polls to cast a ballot in the 2026 midterm elections.The race is expected to serve as a referendum on Republican President Donald Trump’s job performance so far, at the halfway mark of his second term.Recommended Stories list of 4 itemslist 1 of 4Rising costs and tight budgets strain Americans ahead of midterm electionslist 2 of 4Trump’s beef tariff pause sparks anger among US rancherslist 3 of 4Hackers target US campaign finance system days before midterm electionslist 4 of 4Tracking the money: The biggest donors in the 2026 US midterm electionsend of listMaintaining the Republican majority in both chambers of Congress will be key for the success of Trump’s legislative agenda in his final two years.But control of the US Congress could hinge on a handful of closely contested Senate and House of Representatives races nationwide.Candidates, political parties and outside groups are pouring hundreds of millions of dollars into the contests, with major political action committees (PACs), including those associated with billionaire tech CEO Elon Musk, fuelling the spending battle.Which races are costing the most, and who is ban...