 said they held back endorsement to allow harris to build grassroots support for her campaign within 24 hours harris had the support of a majority of house and senate democrats and by monday evening enough endorsements from state delegations to push her over the threshold needed to secure the nomination the democratic leaders say harris's candidacy has injected fresh excitement into the campaign and they are expected to meet privately with her soon the democratic national convention will hold an electronic roll call on august 7th to formally select the nominee