in which type of election are you most likely to see coattail effects

Coattail effects are most commonly observed in presidential elections. This phenomenon occurs when a strong candidate at the top of a ballot (such as the presidential candidate) helps to attract voters to down-ballot candidates of the same party. When a popular presidential candidate has a significant following, it can lead to increased support for congressional and state-level candidates from the same party, as voters may be more inclined to vote for those candidates due to their affiliation with the successful presidential candidate.