Ohio along with Texas is being looked at as a key “firewall” state for Hillary Clinton, much as New Hampshire was after she lost the Iowa caucuses to Barack Obama. If that’s the case, early signs look good for Clinton as a SurveyUSA poll has her leading 56 percent to 39 percent – at least among those surveyed Feb.10-11 before Obama swept the Potomac Primary. Twenty-eight percent of voters said they could change their minds, and 49 percent were Clinton supporters and 40 percent were backing Obama for now, Generally reversing what the exit polls said about the Potomac Primary, Clinton is leading in all age groups, although her 51 percent to 46 percent edge among voters 18 to 34 is close to the 3.7 percent margin of error. Among white voters who comprised 82 percent of the sample, she led 62 percent to 32 percent, while Obama led among black voters (16 percent of the sample) by 73 percent to 24 percent. Hispanics made up only 1 percent of those surveyed. Nearly half the voters chose the economy as the top issue and most of them broke for Clinton, while health care and Iraq were second and third respectively.