When a person purchases from a business, they're making a political statement that they support that person and what they stand for. In addition, if a person purchases from a business, the business makes a profit. With that profit, they can turn around and support political organizations that the buyer might disagree with. It's important to vote with one's dollars.
Yes, I consider a business owner's political position before purchasing from their business if they have publicly come out against something I believe in. For instance, I do not eat at Jimmy Johns because I know the owner does not agree with any of my basic morals. I will always boycott industries like this.
I may choose to support businesses whose views are politically similar to my own. I also may opt not to patronize others, for example, I eat less often from Chick Fil a, and buy less Barilla and I avoid Dominos based on their publicized views on gay marriage and abortion. Sometimes it doesn't make a difference, but I do shop with that in mind.
I will never consider a business owner's political position before purchasing from their business. Everyone has a right to support a candidate of their choice, that's what democracy dictates. Politics should not divide us or bring discrimination. After all is said and done we remain one undivided nation pulling together.