1. Not yet...sorry. (Bull Moose Party all the way!)
2. It doesn't look possible as of now to create new endorsements, but that's a great idea for an expansion set.
3. This I can give a definite answer! It must a PNG file that is 211 by 256 pixels. Make the background transparent, and you'll see the American flag background.
4. It's mostly a matter of personal preference. I like playing FAIR, so I don't load my candidates up with Stamina and Money and whatnot and make them bumbling dolts in the Intellgence and Charisma areas. I personally would try to use the game's candidates for the single player mode, but feel free to test your own candidates out in multiplayer.
