OKLAHOMA CITY (AP) _ More than 600,000 voters are expected to at the polls in tomorrow's primary election.
State Election Board Secretary Mike Clingman says that's a normal turnout for a primary election in a presidential election year.
The primary election includes the race for the US Senate seat vacated by Republican Senator Don Nickles.
All five US House seats are up for election this year. But only the 1st, 2nd and 5th congressional districts have primaries.
Republicans in the 1st Congressional District will choose between Representative John Sullivan and Bill Wortman, president of Wortman Central Air Conditioning Company.
Democratic voters in the 2nd Congressional District will decide between state Representative Dan Boren and former prosecutor Kalyn Free.
Democratic voters in the 5th Congressional District will choose between teacher Bert Smith and lawyer Harley Venters. The winner will face Republican Representative Ernest Istook in November.