There's a lot of changes in this year's primary that will have a big effect on election results.
The legislative district lines were re-drawn for this election cycle, changing polling places, who lawmakers represent and, in some cases, pitting incumbents against each other.
"There are always changes after redistricting," said KTVB political analyst Dr. Jim Weatherby.
But Weatherby added that redistricting won't be the most influential element in the primaries on Tuesday. "That will be a factor. But it's not the factor that the closed primary is."
For the first time ever, the Idaho Republican party will hold a closed primary, meaning you will have to register as a Republican if you want to vote for GOP candidates. Weatherby said that hurts moderate Republicans.
"I suspect the voter in many precincts, I don't want to generalize too much here, will probably be a very conservative Republican," said Weatherby.
Those very conservative Republicans will also be voting on a number of school and fire levies around the state, which could be bad timing for levy supporters.
"We'll see if that's to the benefit of supporters of school levy propositions or not," said Weatherby. "I suspect it will be a real challenge."
Weatherby said the closed primary will also drive down voter turnout. Redistricting could have a hand in that too. Many analysts are expecting a historic night on Tuesday for people not showing up to the polls.
"Turnout in Idaho has been pathetic for many years," said Weatherby. "So, we're talking about a very narrow slice of the electorate who are making very important decisions in this primary."
Weatherby said Idaho only sees about 17 percent turnout in primaries for eligible voters. It could be even lower this year.
But if you don't claim a party, and there's no levies in your area, there's not much reason for you to vote in the primary. For instance, in Ada County, the unaffiliated ballot only has three judges on it, who are all running unopposed.