Two-term Republican U.S. Rep. James Lankford of Edmond is among the candidates expected to file for political office on the final day of filing.
He's expected to file for the U.S. Senate on Friday at the state Capitol in Oklahoma City ahead of Friday's 5 p.m. deadline.
Lankford is among a half-dozen Republicans seeking the final two years of the Senate term being vacated by Republican Sen. Tom Coburn of Muskogee.
Other GOP contenders for Coburn's seat who filed on Thursday include former Oklahoma House Speaker T.W. Shannon of Lawton and former state Sen. Randy Brogdon of Owasso.
A total of 490 candidates have filed for more than 300 elective offices up for grabs in 2014, including both of the state's U.S. Senate seats and all five U.S. House seats.
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