A series of radio ads on behalf of presidential candidate Barack Obama hammer rival John McCain over hot-button issues including abortion and stem cell research. The McCain campaign has responded with an ad outlining McCain's stance on stem cell research, which in turn prompted another salvo from the Obama camp. Evan Tracey of research firm TNS Media Intelligence/CMAG said, "With TV, you have to kind of use a velvet hammer. With radio, you can be a lot more aggressive."
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