NEW ORLEANS — Louisiana Gov. Bobby Jindal diverged from the red meat attacks on President Obama that have characterized the Republican Leadership Conference to caution conservative activists that they ought not demonize the president in the fashion some liberals did President Bush. Jindal recalled what he said were the "shrill, absurd and negative rhetoric" employed by the left during the eight years Bush was in office. "We must not mimic their shallow approach," he said to modest applause in a Friday afternoon speech here. Jindal, who just turned 40, is up for re-election this fall and is widely assumed by...