Everytime I have a discussion with someone who says “both sides are the same”, they always end up voting right. I ask if both sides are the same why not vote left?
I don't think that "both sides are the same", but there is a Venn Diagram of shared interests under the two party system; the overlap is fairly large (e.g., both parties are susceptible to lobbying, both parties fight to maintain first past the post voting, etc.)