But that's a good thing. It would just be too complicated. Furthermore, our decentralized system allows for flexibility and innovation. As for a uniform ballot, it sounds good but it won't work. Some states have special rules for the order in which candidates appear.
Some states allow straight party voting.
There's no way to design a uniform ballot that works under all those laws. Some suggest holding elections on weekends or special voting holidays. Let's take these proposals separately. Concerning weekend voting, Texas has a long history with Saturday elections, and Delaware, Hawaii and Louisiana hold primaries on Saturday. In no case has it been shown that those elections draw more voters than Tuesday votes do.