No, you're not a liberal
A coworker of mine claimed to be a liberal yesterday.
"No, you aren't," I told him. Usually I don't deny people's stated political identity that forcefully, but this guy voted for Bush in 2004.
Now there are conservatives who voted for Bush. There are Democrats who voted for Bush. There are Independents who voted for Bush, and libertarians and Libertarians who (mistakenly) voted for Bush. One might even make a case for moderates voting for Bush.
But no liberals. I suppose you might be "liberal on social issues" and consider those massively outweighed by being right-wing on everything else, but if you voted for GW Bush in 2004, you are ipso facto not "a liberal." Period. Paragraph.
End of story.