[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/08/29/art.gop.sign.gi.jpg caption=] FROM CNN's Jack Cafferty: The Democrats went out with a bang last night at Invesco field, and may have ended the week with one of the best political conventions ever. This also means they've left John McCain and the GOP with one tough act to follow when they convene in St. … Continue reading How can GOP top Dems convention?