The Worthlessness of National Political Polling

We hear news reporters and political pundits tell us regularly about national polls on the various candidates for president. Since the nomination process is a state by state process, what good are national polls? No good at all except to give news reporters and political pundits something to talk about. They may show trends that can influence voters in the upcoming primaries, but how is this actually helpful? It would better serve the electoral process to hear stories on the positions of the candidates. However, it's easier to report a national poll and explain momentum changes than to explain positions on issues. So, we can expect more reporting on national polls and the current dearth of examination of the candidates' positions on issues. This is just one more example of how the American public is poorly served by the news media.