Officials in Bridgewater and Raynham have moved their annual town elections this spring to coincide with the state primary to fill the US Senate vacancy created by former US senator John Kerry's departure. The two towns would have normally voted on April 26, just three days before the April 30 primary. Bridgewater and Raynham hold local elections on the same date each year because they share a regional school district, and voters cast ballots for all school candidates regardless of which town they come from. Merging the elections is expected to save money. Officials also anticipate more participation in the local elections, since state contests generally draw more voters out.