I think a lot of RP support has come from waking up apathy in people that used to not vote. You have to register so far in advance of these things, I wonder how many didn't meet those deadlines---so states had deadlines of last summer...some have party switching deadlines.....A lot of newer, interested people don't understand their states' rules on regular voting vs a cacaus...closed vote vs open vote, etc....
The real problem is with the American people in general. Look at the answers Greta got from polling the question - Why did you vote for.....?
These are some real answers...
a) He's best looking
b) He's black
c) She's a woman
d) first name on the list
e) name sounded good
f) all my friends said to
g) they are going to win anyway
h) I don't know
who you gonna blame?