Shaylee Ragar

For years, political parties in most states have avoided getting involved in primary races -- leaving the choice to voters. But in many places, those elections are looking different this year.

As property values rise, Montana is seeking to cut taxes for most properties but raise them for out-of-state homeowners.

Montana not only went enthusiastically for Trump for a third time, but took the last statewide seat held by a Democrat. Senator Jon Tester's defeat caps a years-long quest to erase purple from Montana's map.

Montana could help decide control of the U.S. Senate this cycle. With polls showing former Trump leading in the state, Tester will need voters who aren't sold on either party to hang on to his seat.