On the heels of several polls showing a tightening race in Pennsylvania, Survey USA says that Hillary Clinton is leading Barack Obama by 56 percent to 38 percent. The poll was conducted April 5-7 and has a 41 percent margin of error. Clinton is running fairly evenly with Obama among men voters but leads him 61 percent to 33 percent among women. She leads in double-digits among all age groups above 35, and particularly among seniors where she has a 3-to-1 advantage. There is a huge racial divide: Clinton leads 61 percent to 32 percent among the 82 percent of the sample that is white, while Obama leads 74 percent to 24 percent among the 14 percent who are black. Of the 45 percent of voters who say the economy is the campaign’s top issue, Clinton leads 54 percent to 40 percent. Eighteen percent of Democratic voters say Iraq is the top issue, and she leads among them by 52 percent to 43 percent. Health care is third at 15 percent, and those voters prefer Clinton 59 percent to 32 percent.