“Boxer’s liberal record has sharply divided voters, and she has long been less popular than California’s other U.S. senator, fellow Democrat Dianne Feinstein. A Field Poll released in March found voters about evenly divided on Boxer’s reelection, with 43% inclined to support her and 44% leaning against. But in a hypothetical matchup with Fiorina, voters favored Boxer 55% to 25%.”