An editorial in the New York Times supports students' right to vote in Iowa caucuses:

Student are rightly up in arms about these statements. The law in Iowa is crystal clear: students who attend school in the state are entitled to register to vote in the state as long they are not registered anywhere else. The two parties’ rules say registered voters may participate in caucuses in the precincts where they are registered. Students have the same right to do so as any other Iowan.

The pressure from student groups has caused uniform positions reflecting the NYTimes' position. This shows the power students have when they put their mind to it.