[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2011/images/08/30/costello_vert.jpg width=200 height=230 align="right"] From CNN's Carol Costello: Hit with polls showing low approval ratings, President Obama has recently been kicking up his fiery rhetoric and appealing to his liberal base, who have been frustrated with him for seeming weak in the face of Republican attacks. The new assertive Obama first appeared during … Continue reading Talk Back: Is President Obama's new fiery persona resonating?