TAMPA, Florida — Hillary Clinton named Virginia Sen. Tim Kaine as her vice presidential running mate Friday, adding a centrist former governor of a crucial battleground state to the Democratic ticket. In a text message to supporters, the presumptive Democratic nominee said, "I'm thrilled to tell you this first: I've chosen Sen. Tim Kaine as my running mate." On Twitter a few seconds later, Clinton described Kaine as "a man who's devoted his life to fighting for others."