好的,这是根据您的要求修改后的标题: **US midterm results: Democrats gain ground in House and Senate races**
Democrats secured a Senate majority and made substantial progress toward controlling the House in the 2026 US midterm elections, delivering a significant blow to President Donald Trump and Republicans. Democrats gained six Senate seats and flipped more than a dozen House seats, including victories in Texas, Kansas, and South Carolina, plus gubernatorial wins in Georgia, Ohio, Iowa, and Texas. Voter dissatisfaction with rising costs and support for stronger congressional oversight of presidential decisions drove the results. Trump dismissed impeachment concerns, saying it would "destroy the Democrat Party," while Vice President JD Vance blamed the war on Iran for Republican losses. New York City Mayor Zohran Mamdani urged Democrats to keep their "foot on the gas," calling it "a new dawn in America."