The GOP field to replace Rep. John Shadegg (R-Ariz.) won't include the biggest name of all.

Phoenix Mayor Phil Gordon has announced that he won't run for the seat.

He would have joined a vast field that so far includes former state Sens. Pam Gorman and Jim Waring, former state Rep. Sam Crump, Paradise Valley Mayor Vernon Parker and Ben Quayle, the son of former Vice President Dan Quayle.

Attorney Jon Hulburd remains the only Democrat in the race, which will be an uphill battle for his party.