加州2024年6月初选中，近15万张邮寄选票遭拒。根据官方统计，被拒选票总数达148,241张，拒绝率为1.73%，较同年初选的1.56%有所上升[1]。
选票被拒的原因多样，其中邮戳日期晚于选举日是最主要的因素。逾9.3万张选票因邮戳过晚而被拒[1]，占拒票总数的大部分。此外，约44,000张选票因签名不匹配被拒，8,300多张因缺少签名被拒[1]。在各县中，图莱里县的拒绝率最高，达3.52%[1]。
加州选民基金会主席金·亚历山大指出："因邮戳过晚而拒票主要是邮戳日期本身过晚，而非到达时间过晚"[1]。美国邮政的政策变化可能导致邮戳延迟，引发了政界关注。威斯康星州参议员塔米·鲍德温和州长托尼·埃弗斯曾在6月呼吁美国邮政解决延迟问题[1]。
根据布鲁金斯学会2025年的报告，邮寄选票舞弊率约为每1000万张选票中4例[1]。
California's June 2024 primary election saw approximately 148,241 mail ballots rejected, representing a rejection rate of 1.73% [1]. This marked an increase from the state's March 2024 primary, which had a rejection rate of 1.56% with 108,982 ballots rejected [1].
The primary reason for rejections was postmark issues. More than 93,479 ballots were rejected because their postmark dates fell after Election Day [1], accounting for the largest share of discarded votes. The second most common reason involved signature mismatches, affecting nearly 44,000 ballots, while over 8,300 ballots lacked signatures entirely [1].
Postmark delays have raised concerns among election officials. According to Kim Alexander, president of the California Voter Foundation, most rejections due to late postmarks stem from the postmark date itself rather than late arrival [1]. Changes to U.S. Postal Service policies may be contributing to the postmark delays, prompting Wisconsin officials to take notice. In June, Wisconsin Governor Tony Evers and Senator Tammy Baldwin called on the U.S. Postal Service to address the delays [1].
Rejection rates varied significantly by county, with Tulare County recording the highest rate at 3.52% [1]. For context, a 2025 Brookings Institution report found that mail-in ballot fraud occurs at a rate of approximately four cases per 10 million ballots cast [1].