At the end of the day most people are selfish. If they are in a cushy well-paying job they're angry that they're paying more taxes. If they are in a needy spot, they are angry that they don't get enough help. There's only so much each side can do to justify their feelings.
What's important is what percentage of the electorate is feeling what. Right now, the trend is towards helplessness and dissatisfaction with the current economic status quo which is fairly conservative in this country. At the rate things are going things are going to get worse economically and we may very well see 1930s style policy adjustments. I don't see most Americans, especially those raised comfortably playing video games and being told that they could accomplish anything by their parents, being willing to accept hardship in the name of Ayn Rand.