Ten Democrats in California’s congressional delegation announced their support Wednesday morning for Redlands Mayor Pete Aguilar for the 31st District.

Their endorsements are likely an effort to push other Democratic candidates out of this competitive race — including an ex-colleague, former Rep. Joe Baca.

The party had primary problems in this district last cycle, when a bevy of candidates splintered the Democratic vote, allowing two Republicans to head to the general election. California’s primary allows the top two candidates, regardless of party, to advance to the general.

This election cycle is looking like déjà vu for Democrats in the 31st District, which is a targeted race again. In 2012, Republican Rep. Gary G. Miller won re-election in this district that President Barack Obama carried.

Baca, who lost last cycle after choosing to run in California’s 35th District following redistricting, has announced he is seeking the 31st District seat in 2014.

And EMILY’s List is looking poised to support attorney Eloise Reyes, who has announced she is running in the 31st District as well.

Aguilar, who ran an unsuccessful campaign in 2012, has the support of the Democratic Congressional Campaign Committee.

The members who endorsed Aguilar on Wednesday are:

• Rep. Karen Bass
• Rep. Julia Brownley
• Rep. Judy Chu
• Rep. Janice Hahn
• Rep. Alan Lowenthal
• Rep. Scott Peters
• Rep. Adam Schiff
• Rep. Eric Swalwell
• Rep. Mark Takano
• Rep. Henry A. Waxman

They join California Democratic Reps. Loretta Sanchez and Gloria Negrete McLeod, who announced their support for Aguilar earlier this month.