An idea for the DNC?

I have great idea for the DNC. I think they should strip party affiliation of every Clinton support that votes for McCain in this election. Especially since voting Republican is not following with the standards of the party. I think they shouldn't be affiliated with the Democrats if they won't vote for the party. What do you think? Then they might not her able to vote for Hillary again if their state has a closed primary. If you don't vote for your party why should you be allowed to stay in it?