“Targeted by progressive activists hoping to kill his chances of being Hillary Clinton’s running mate, Julián Castro is set this week to announce changes to a hot-button Housing and Urban Development program to sell bad mortgages on its books,” Politico reports.

“Castro’s actions could potentially defuse an issue that activists have been using to question his progressive credentials — and he’ll be doing it at the moment the running mate search has begun to get serious at Clinton campaign headquarters.”