Involuntarily abstaining

I'm still registered to vote in Texas while in school in Missouri.  I applied to vote for Ron Paul in the Republican primary by mail but they sent me a Democratic ballot by mistake.  There isn't enough time before election day to have them send the correct ballot, so I called to see what my options were, and they said that basically I've been disenfranchised and all I can do is complain officially.  I considered just voting in the Democratic primary after all since I vastly prefer Obama to Clinton, but I have no opinions on the rest of the ballot, and besides voting for the lesser of two evils is still voting for evil.  (A principled voter who studies the manipulation of voting systems—a contradiction, I know.)  As for Ron Paul, he'll just have to win Texas without me.