Unfortunately, political calls are not subject to the Do Not call list. The politicians who enacted that law weren't about to include themselves in it. Kind of like Obama Care.....
I have a call blocker device on my landline and immediately blocked this number. If they do call again, it will ring once to identify the number that it is actually a blocked number and it will be cut off right away. You may be able to block a certain number of calls, depending on your service provider. I find my device, that can block 1,200 numbers as well as entire area codes, easier to use. Unfortunately, I have heard that requesting to be removed from lists (even if you can reach certain numbers) only indicates it is a live number and will be passed on to other telemarketers, etc.