WASHINGTON — Hillary Clinton named U.S. Senator Tim Kaine as her running mate on Friday, making a safe choice that will help her present the Democratic ticket as a steady alternative to the unpredictable campaign of Republican presidential rival Donald Trump.The selection of Kaine, a self-described “boring” Virginian with wide governing experience and a reputation for low-key competence, could appeal to independents and moderates but is likely to anger liberal groups who object to his advocacy for an Asian free-trade pact.But the Spanish-speaking former Virginia governor and Richmond mayor fits Clinton’s long-stated criteria that the vice presidential choice be a capable partner who is ready to take over the presidency if necessary.Clinton made the announcement via Twitter after the first day of a two-day campaign swing in Florida.Kaine, 58, edged out two other finalists - Cory Booker, a U.S.