Okay, DCist readers, we give you the highly-anticipated and long-awaited winner of the First Annual DCist Halloween Costume Contest: Nacho Libre! Well done, sir. Nacho had a commanding lead from the start, and ended up with over 30% of the vote. Not terribly far behind Mr. Libre were the two adorable pandas from Georgetown with 25%, and Miss. E. Coli Spinach came in a respectable third, with 18% of the readership vote. As for the…