Frank Antenori, a state senator in District 30, became the first official candidate to announce his intentions to run in the Congressional District 8 special election.
Friday's announcement was not a surprise, as Antenori had recently formed an exploratory committee to look at running for the seat.
After Congresswoman Gabrielle Giffords resigned last Sunday, candidates have started preparing for a special election this year. They will also have to prepare for an election in 2013.
Giffords' term is set to expire in January 2013.
Antenori made the announcement in Green Valley to a group of Republicans, and reporters
In the announcement, Antenori said besides running for the District 8 special election, he is also preparing to run in CD2 in November, which is what District 8 will become under the new congressional boundaries.
Antenori spoke briefly about the budged, stating the federal government must become more fiscally responsible. He brought up the state's effort to balance Arizona's budget last year.
Antenori throwing his hat into the ring is no surprise. In August, Antenori formed an exploratory committee to consider running.
Republican Jesse Kelly is also considering running in the election. An announcement is expected some time next week.
Kelly lost to Giffords by a small margin in 2010.