LONG before he turned his attention to stimulating the economy, Barack Obama had to take care of a few issues at home in his marriage to Michelle. During a rough patch in 2000, “There was little conversation and even less romance,” writes Richard Wolffe in his new book, “Renegade: The Making of a President.” “She was angry at his selfishness and careerism; he thought she was cold and ungrateful,” writes Wolffe, who covered Obama’s White House campaign for Newsweek. “She hated the failed race for Congress in 2000, and their marriage was strained by the time their youngest daughter, Sasha, was born. Politics seemed like a waste of time to Michelle,” the book says. But the couple seem to have put any past issues behind them — “Today things are much better,” Wolffe noted on “Inside Edition” yesterday.