Kamala Harris just said that if elected she will bring down pric

Cape May County - Kamala Harris just said that if elected she will bring down prices. I would like to know what prevents her from doing that right now? She is currently the Vice President and although she has had a poor record of getting things done I would think a desire to be president would give her the desire to do it now and show her talent. If people see she can lower inflation now won’t they be more likely to vote for her? Otherwise people will think she's just all talk.