U.S. House of Representatives
District 1 - John Sullivan (R) - he is running for re-election and it appears he has a challenger from within his own party (Nathan Dahm) but nobody from the Democratic Party has announced a run for the 1st District.
District 2 - Dan Boren (D) - he is running for re-election in 2010 and the Republicans have at least 5 people seeking their party's nomination to run against him.
District 3 - Frank Lucas (R) - as far as I can tell, he is the only person running for this seat.
District 4 - Tom Cole (R) - this incumbent has another person trying to seek the GOP nomination for this congressional seat in R.J. Harris.
District 5 - Mary Fallin (R) - not running for re-election to Congress because she is running for governor. There are quite a number of people running for her spot.
Jim Inhofe (R) - he is not running in 2010 because he just won re-election 2008.
Tom Coburn (R) - he is running against in 2010 but so far I have not been able to find any information about who is running against him.