The emergence of Sarah Palin as a political force in the presidential race has left many top Democrats fretting that, just two weeks after their convention ended on an emotional high, Barack Obama's campaign has suddenly lost its stride. Obama has responded aggressively this week to Palin's presence on the Republican ticket, using TV ads and campaign rallies to attack her contention that she is a political reformer who will take on the Washington establishment -- a role Obama has long claimed as his alone. But some Democrats are now worried about the perils of Obama's strategy, saying that his...
