Part of the difficulty in tracking the process of realignment as it unfolds is because it does not proceed smoothly. As society changes, party leaders are often slow in recognizing or responding to the change. A response to changing conditions may be delayed because newcomers to the party argue for the need to change policy positions, but existing incumbents and interests resist change. And when responses do come, they are not always clear. New issues emerge that are not about economic divisions and the parties are not sure how to respond.