Former Capitol Hill aide Amanda Renteria plans to announce on Sunday her campaign to oust Rep. David Valadao, R-Calif., in the 21st District.

Nathan Gonzales of the Rothenberg Political Report reported earlier this month that Democrats had recruited Renteria to run. An ex-Capitol Hill staffer, she previously worked for Democratic Sens. Dianne Feinstein of California and Debbie Stabenow of Michigan. Renteria was also the subject of a 2008 Roll Call profile.

Last cycle, a lackluster Democrat challenged Valadao, and the congressman won by a 16-point margin.

The announcement will take place in the morning at a park in Sanger, Calif., according to her campaign.

The race is rated Tossup/Tilt Republican by Rothenberg Political Report/Roll Call.