Barack Obama now leads Hillary Clinton ffor the hearts and minds of Democrats by 52 percent to 41 percent in the Gallup daily tracking poll conducted May 15-17. The margin of error is 3 points. The last time Obama held this big of a lead was in mid-April. But Gallup’s news isn’t as good for Obama on the general election front. In data collected May 13-17, McCain edges Obama 46 percent to 45 percent, with a 2 percent margin of error, indicating how competitive that race looks from this vantage point. Clinton leads McCain 47 percent to 45 percent, also not a statistically significant number.