FROM CNN's Jack Cafferty: For a second straight day, a new poll of likely voters in the Iowa caucuses has Minnesota Congresswoman Michele Bachmann as the front-runner of the current field of GOP candidates. [cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2011/images/07/12/art.bachmann.jpg caption="Michele Bachmann"] She's big with Tea Party voters, running on smaller government, no new taxes, but she's come under … Continue reading Michele Bachmann's leading in Iowa and Sarah Palin thinks she can be president. Are the Republicans in trouble?