Never underestimate the sensitivity of the legal profession. The Lawyers' Travel Service did, in this ad that ran last month in The Wall Street Journal. And both have promised never again to run the ad. Feedback from "incensed" callers and letter writers vowing never to use the service has been "emotional and somewhat negative," said Marketing Director Robin Waldman, who started last week and was quizzed about the ad during her job interview. (She said she thought it was "clever" but contrary to the "positive, patriotic feelings" about the president). The ad, produced in-house, cost $3,000 to run in the Journal's New York and Washington issues. It was the company's first foray into consumer advertising, Ms. Waldman said.