or, "I'll write-in the candidate of my choice" or anything along those lines: I hope to God that you're doing everything in your power right NOW to make sure that X (be it Hillary or Obama or Edwards) does NOT win the nomination.
I've been pondering a post like this for a while, but now I have to say this.
If you will not or can not support any of our Dem nominees should they win the primary, you had BETTER be out there working for someone you CAN support.
If the thought of voting for Hillary (for example) makes you ill, get off your ass and campaign for Edwards. Or Obama. Or Kucinich.
What I cannot tolerate is people who are willing to throw away their votes (yes, I said it...THROW AWAY THEIR VOTE) by voting for a 3rd party candidate or a write-in, but are not willing to set aside some time now to ensure that won't become necessary.
If you're sitting behind your computer playing keyboard commando, but you're not doing everything in your power to make sure that your guy (or woman) wins the nomination, then YOU HAVE NOBODY TO BLAME BUT YOURSELF. Put your time/money/whatever you can where your keystrokes are. Or shut the fuck up.