@jeffcliff@niu.moe It opens the party up to charges that it doesn't stick to its positions and is thus untrustworthy. Politicians try to convince the electorate they have strong principles so they can be relied upon to do the right thing, but if they adopt another party's position, either they are opportunists who seek political advantage by abandoning their principles, or they aren't competent enough to have come up with the better position on their own.