March 16 (UPI) -- Illinois will have busy primary elections Tuesday as voters select a candidate to replace retiring U.S. Sen. Dick Durbin and fill five U.S. House seats without incumbents.

Three House seats are open due to retirements, and two others have incumbents running for Senate. All seats are expected to be filled with Democrats.

There will also be primaries for governor of the state, but there are no Democrats running against incumbent Democrat JB Pritzker.

Illinois voters "have an opportunity for generational turnover -- where a boomer senator is stepping down, and you've got three Gen-Xers, who've been around on the scene for quite some time, trying to get the seat," Northwestern University political science professor and Democratic strategist Alvin Tillery told ABC News. Tillery is not involved in any Illinois races.

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