民主党横扫多州选举，共和党失利背后的政治极化趋势

Core Viewpoint - The recent special elections in the U.S. indicate a significant victory for the Democratic Party, suggesting a shift in political dynamics and strategies, particularly in response to rising living costs and the impact of Trump's presidency [3][4][6]. Group 1: Election Outcomes - The Democratic Party achieved key victories in Virginia, New Jersey, and Pennsylvania, winning all state-level positions in Virginia and securing significant wins in New Jersey [3]. - In California, Governor Gavin Newsom's proposal to change the redistricting process is expected to secure up to five additional congressional seats for the Democratic Party [3]. - The elections are seen as a reflection of public sentiment towards Trump's administration, with many voters expressing dissatisfaction with his performance [10]. Group 2: Key Issues - "Cost of living" emerged as a central campaign issue for Democratic candidates, with several candidates successfully leveraging this topic to gain voter support [6]. - In New Jersey, Democratic candidate Mikie Sherrill won by a 13-point margin, promising to freeze public utility rates and criticizing Trump's unfulfilled promises regarding affordable living [6]. - A Yale University estimate indicates that the average effective tax rate for U.S. consumers is at its highest since 1934, which is projected to negatively impact the labor market and purchasing power [7]. Group 3: Republican Challenges - The Republican Party is facing challenges in the wake of these elections, with analysts suggesting that the party's failure to address rising living costs contributed to their poor performance [6][8]. - Trump's absence from the ballot is cited as a factor in the Republican losses, with concerns about how to convert his support into votes for other candidates [10].