Yesterday's testimony from Fed Chair Janet Yellen, progress on the debt ceiling, bullish Chinese trade data, and upbeat earnings from John Deere ( DE ) are stifling profit-taking pressure, but the upside is limited into comments from St. Louis Fed President James Bullard. Futures appear to be fatigued Wednesday and are straddling the flatline as Wall Street takes a breather after four days of impressive gains. Although Bullard is not a voting member this year, his hawkish comments tend to unnerve markets as they indicate a bias towards higher short-term rates as thresholds on inflation and joblessness are reached.