A daily tracking poll will usually refer to the approval of the general public of a person in a political office or position. Typically speaking, daily tracking polls will usually be conducted in the United States in regard to the approval of the United States President, though other officials in politics and government may also be the subject of a daily tracking poll.
Daily tracking polls are usually conducted by polling firms, which use certain kinds of data in order to produce the results of a daily tracking poll in regards to a certain official or politician.
However, all polling firms will collect and reflect data in terms of the general population, and thus, there will be certain statistical analysis that may not reflect the actual data, but rather an approximation. Daily tracking poll firms, most famously known being the Rassmussen and Gallup Polls, use certain kinds of data in order to produce the results. They use what is called as a dynamic weighing process, which takes into consideration the political party affiliation of the people that are being polled.
Daily tracking polls will often take other issues into consideration, not just in regards to approval ratings of the American President. In certain cases, a daily tracking poll can involve issues that have a national impact. An example could be War in Iraq, where people may poll on certain aspects such as when they believe the troops will be home or the overall effectiveness of the war.