The question of what is a true patriot hinges mainly on how you define patriotism itself. There are those that think that patriots show undying support to their leader(s). Some who think that patriots show undying support to their flag. I personally have a much broader definition of country. I believe that the country is everyone and everything in the country, physically or theoretically. This means it's citizens, it's leaders, it's ideals, and everything in between.
So therefore a true patriot is someone who supports their fellow countrymen and gives of themselves for the good of the country as a whole. Soldiers, for instance, are patriots in my eyes, even though I may not support everything they are ordered to do. They took it upon themselves to put their lives on the line for their country. They sacrificed of themselves for the benefit of the rest of us. In my opinion, if you vote, you are a patriot, because you are showing your support for your country by saying how you wish this country to be run. The mere act of voting proves that you have a vested interest in this country and want it to move forward in a better direction, regardless of who or what you vote for. In your mind, what you have voted for is what you believe is best for you, me, and the country as a whole.