BOSTON—Campaigning in his home state, John Kerry vowed Monday to raise taxes on his wife Teresa Heinz Kerry, whose worth is estimated to be in the range of $900 million to $3.2 billion. "My spouse has benefited long enough from tax cuts," Kerry said. "If Congress increased her taxes by 15 percent, this country would have millions of dollars to use to create new jobs and explore alternative energy sources." Kerry added that it's high time that billionaires like the one with whom he shares his life start paying their fair share.