are you sitting on your bum all day chatting/texting up your friends, surfin the net, doing whatever you want, showing up at whatever time or day you wish, coming in wearing torn sweats & flipflops, leaving whenever you wish OR are you doing what supervisory staff request you to do, arrive & leave at pre-specified times & days, wearing business style clothing & putting a professional educated attitude into the day? If it is the former, than no, it is NOT real work; if it is the latter, then YES it is real work.
The purpose for internships (usually at the end of education/training) is to solidify your abilities, gain experience in the real world of a business sector & to refine & improve the skills you obtained in your education/training. It is usually ended by an offer of employment if you performed at an appropriate or better level. In a congressional campaign you are probably being utilized as free helping hands & may-depending on your performance-be offered a job as a congresional assistant or liason for a congressman/woman to another foreign government or business representative. That happened to my cousin in the late 90's & she made big big money as the liason with an Asian electrical co that was helped along with one of our congressmen back then. No matter what happens, this is job experience for you, so yes put it on your resume...some of us (former) HR like to see that you're willing to work to excell yourself in your profession or education & don't expect a hand out just because you showed up that day. I hope it's a great experience for you.