Oregon voters are facing a familiar theme on their primary ballot: well-financed Democratic incumbents looking to slide past little-known challengers while Republicans attempt to nominate candidates who could put up a fight in November in a heavily blue state.

Oregon’s Democratic Gov. Tina Kotek and the nearly two dozen challengers hoping to defeat her are among the candidates on the ballot in Oregon's primary.

Oregon voters are facing a familiar theme on their primary ballot: well-financed Democratic incumbents looking to slide past little-known challengers while Republicans attempt to…