Nope, sorry, this is just plain wrong. As wrong as those who vote based solely on a persons position on abortion. There shouldn't be just one litmus test for a candidate, but a careful study of their entire platform and agenda.
Rand Paul? He may be against internet censoring, but he's also said that he thinks the civil rights legislation should be overturned, that he should have the right to refuse service to anyone he chooses to. Welcome to the new 'good old days' of Jim Crow, where anyone can post whatever they want on the net, but they can't get service at the local diner.