发现这场竞选大致势均力敌，多项调查显示每位候选人的领先幅度都在误差范围之内。
have found the race is more or less a dead heat, with several surveys showing each candidate with a lead within the margin of error.
近年来，爱荷华州一直是可靠的共和党州，特朗普在三次竞选总统中均赢得了该州，共和党还掌控着该州的两个参议院席位和全部四个美国众议院席位。
Iowa has been a reliably Republican state in recent years, with Trump having won it in all three of his bids for the presidency and the GOP controlling both Senate seats and all four U.S. House seats.