A political organization is unique in the way that it is made up. A political organization brings a group of individuals with a common purpose together as they work towards a goal. These goals could be to help an individual become elected to office, to help a bill get passed, or to raise awareness of certain issues. These are organizations that will need an employer identification number, just like any other organization.
As a political organization, you need the Tax ID (EIN) number to do a variety of things. As you take in donations, you need a bank account to hold the funds. At year-end, you need to file tax returns to the IRS with all of your earnings, expenses, etc. All of these need that unique identifier. It is important to go through the process early as a political organization so that you can have this information on-hand when the Internal Revenue Service needs it. The last thing you want to do is to wait too long and end up being shut out.