WASHINGTON (AP) — There’s no shortage of competitive, high-stakes races and candidates with famous last names in Maine’s state primary on Tuesday.Primaries for U.S. Senate and U.S. House will set the stage for a midterm general election in which Maine is expected to play a critical role in deciding control of both chambers. Maine voters will also have the opportunity in November to demonstrate the state’s fiercely independent streak when it comes to electing a new governor.The races feature the son of a U.S. senator, the daughter of a congresswoman, the brother of a former governor and the nephew and cousin of two presidents.Republican Sen. Susan Collins is unopposed for renomination to a sixth term, which would put her on track to become the chamber’s longest-serving member from Maine.Collins, the only Senate Republican to represent a state that Democratic presidential nominee Kamala Harris carried in 2024, is a pivotal figure in the effort to win control of the chamber in November. The 51% of the vote she received in her 2020 election bid was her poorest showing since the 49% she received in her first successful run in 1996. She is frequently at the top of Democrats’ list of incumbents to oust, but her Democratic opponents have never surpassed the 44% mark in her five previous races.