(Bloomberg) -- Joe Biden’s expected re-election bid will thrust his wife, Jill Biden, further into the public eye, as the White House deploys the self-described introvert to help win over women. But within the White House she is understood to be the president’s closest and most protective confidante. Jill Biden’s office declined to make her available for an interview. Image ConcernsThe couple have been married since 1977, about four-and-a-half years after Joe Biden’s first wife and daughter were killed in a car crash. "That is a huge contribution to normalizing the idea of first ladies working outside of the White House,’’ Wright said.