LAS VEGAS (AP) - Democratic U.S. Rep. Shelley Berkley is making her Senate bid official.
Berkley planned to file papers Wednesday declaring her candidacy in Nevada's U.S. Senate race.
The seat is occupied by Republican Dean Heller, who was appointed from the House to the Senate after Republican John Ensign resigned last year amid an ethics investigation involving an extramarital affair.
Heller filed his candidate paperwork last week.
Heller is expected to face Berkley in the November election. Both have the backings of their parties but will still have primary competition.
At least two Democrats are challenging Berkley in the primary, including former U.S. House candidate Nancy Price. Price lost to Heller in 2010.
Heller will face at least three Republican rivals, including Ed Hamilton, a frequent candidate.