Gov. Linda Lingle is calling on fellow Republican voters to cast GOP ballots and not to stray into the Democratic primary.

Lingle made the comments Tuesday when she voted early at Honolulu City Hall.

The governor said crossover voting makes it more difficult to achieve a viable two-party system in a state traditionally dominated by Democrats.

State GOP Executive Director Dylan Nonaka last week also urged Republicans not to meddle in the Democratic gubernatorial primary between Mufi Hannemann and Neil Abercrombie.

Some Democratic activists also say they worry that GOP voters will cast ballots in the Democratic lieutenant governor contest, where two of the six major candidates are considered socially conservative.