A splashy White House announcement on artificial intelligence investment is a shot in the arm to Nvidia and a host of other portfolio stocks involved in the AI boom. The news OpenAI, Oracle , Softbank and investment fund MGX established a new company — dubbed the Stargate Project — to build AI infrastructure in the U.S. In a press release, ChatGPT creator OpenAI said $100 billion will be deployed “immediately,” with plans calling for a total of $500 billion in investment over the next…