|John Bartlett - The man behind the book|
But wait there's more ... There are two other things to consider: (1) Has the quote been registered as a trademark? (2) Is the quote so closely associated with a living person that by using it you are implying that person's endorsement? As for the first question, you can research the issue at the USPTO. We've prepared an explanation on how to search. The second question is less likely to be a concern as we doubt your use will trigger a right of publicity claim. However, it wouldn't hurt to conduct an informal survey of friends and workers and ask, "What do you think of when you see this ad?" If everybody answers, "Didn't Donald Trump say that?" you may want to regroup, especially if you're running a national campaign that might be seen by The Donald.