You may just have the time to blurt out, “Senator Such-and-Such, do you know why Election Day is a Tuesday?”
But, if you have more time, you can also provide a little preamble: “Senator, I know that voter turnout is very important to you, and of course Tuesday elections are a central part of your professional life. I was wondering if you’d ever wondered why we vote on Tuesdays, and if you could tell me why?”
And if you really have a lot of time- or if the official you ask actually answers correctly- you can follow up: “Ms. Senator, do you think it makes sense that we vote on a day chosen for the convenience of voters over 150 years ago, when the way we work, live, and travel is so entirely different today?”
Ultimately, as long as you’re respectful but firm, you’ll get an interesting answer and we’ll be delighted to see it.