Key Senate races in Alabama, Georgia, Oklahoma headline US primary elections in 4 states, Washington, DC (opens original article in a new tab)

Key Senate races in Alabama, Georgia, and Oklahoma are highlighted in US primary elections, alongside California's congressional seat replacement and Washington, DC's mayoral election.

• Key Senate races in Alabama, Georgia, and Oklahoma are highlighted in US primary elections.
• California is seeking to replace a congressional seat vacated by Democratic US Rep. Eric Swalwell.
• Washington, DC is holding elections to choose a new mayor.