While I’m just as guilty of it as every one, this thread sort of shows the problems inherent with us using the terms liberal and conservative as we do.
I kind of like how the Political Compass approaches the matter (while that is the most prominent example of this online, the Political Compass is strongly grounded in political science theory), you have two axes. One axis represents authoritarianism on one end, and anarchism on the other (actually the political compass uses authoritarianism/libertarianism, but I feel libertarianism is too loaded a word), the other axis represents a completely managed economy on one end and a completely deregulated economy on another.
Liberal and Conservative are such catch-all terms encompassing so many different political views in the United States that when you’re talking about “America becoming more liberal” or “America becoming more Conservative” those statements lose all meaning because the words themselves don’t mean any precise thing.
“True” liberalism, or at least liberalism as defined by political scientists is almost entirely concerned with personal liberties.
In the United States, you can’t really say that the “Liberals” or “Conservatives” as we use those terms, have a monopoly on concern for personal liberty. Republicans are concerned very strongly with certain personal liberties; while Democrats tend to be strongly concerned with a different set of personal liberties.
Income redistribution, welfare, universal health care, those are not liberal ideas. Those are leftists ideas. That does not mean they are necessarily incompatible with liberalism, but they are not part of the liberal school of thought, they’re part of the leftist (aka Marxist) school of thought.
Environmentalism is likewise outside the scope of liberal and conservative ideology. It tends to have more to do with leftism/rightism. People who believe in a completely unregulated economy tend to think that means we shouldn’t have environmental regulations and et cetera, people who think we should have a more regulated economy think we should. Even then that’s not absolute, though. Theodore Roosevelt was the first significantly environmental President and he frequently defined himself as conservative. In fact Roosevelt provided an excellent definition of conservative that is more or less free of any ideological baggage. Roosevelt viewed conservatism not as an ideological stance but a stance concerning how decisions are made in society.
Roosevelt felt that what conservatism meant was, you aren’t opposed to change, you are opposed to rapid change. And that you only support change when it is clearly demonstrable that said change will produce a net benefit that outweighs the damage that any change can cause and the damage that change in particular would cause.
So this debate really needs to be rephrased in one of two ways, “Are more Americans becoming Democrats?” (because that is what the catch-all term “liberalism” tends to mean in America today, Democrats are liberals is the general and totally incorrect consensus) or “Are Americans becoming more leftist?”
The answer to the first question is probably not. The Democratic party has actually always had more members than the GOP. The Democrats were the only show in town during Jackson’s presidency, after that they’ve always been the party with the most members. There were more Democrats than Whigs and there have always been more Democrats than Republicans. What does that necessarily mean? Not much, because enough Democrats have foregone voting a straight-party ticket that traditionally, despite being a permanent minority party in terms of percentage of the population, the GOP have won many major elections. The trend really seems to be more towards more people not registering as members of either party as opposed to a trend towards more party registration for one party over the other.
Is America becoming more leftist? The answer to that, is mixed. We’ve outright rejected many key leftist principles and I honestly do not see them coming back. Bill Clinton was very popular because he rolled back the welfare state. People are probably getting on board with the idea of universal health care, but this isn’t necessarily surprising. Health care expenses are getting so out of control that people who would not otherwise be inclined towards leftism feel that this is an area where the government is just going to have to step in and take over.
But Americans don’t like the idea of “something for nothing” in general, even if they are willing to get on board with universal health care. That’s why giving poor people permanent stipends just isn’t something you can reasonably expect to ever happen in the United States. There was a time when we had extremely high tax rates on the top marginal bracket and instituted some pretty leftist ideas, by and large those ideas have been soundly rejected. We’re fully 120 years past the beginnings of Socialism and by and large the United States has experimented with it like a college student will experiment with drugs, but ultimately shows no signs of becoming markedly socialist. The U.S. has always been open to incorporating certain socialist ideas, especially when they are in line with American world view about fairness and democracy. That’s why labor unions caught on, it just seemed “right” that in a free country workers should have the right to organize. It’s also why Americans rejected the welfare state and why Bill Clinton was popular for reforming welfare, Americans do not feel people should get a free ride.
Americans also dislike corruption and immorality, this is why they got on board with corporate regulations concerning food and drug safety. Americans also believe in fair play, which is why they got on board with trust-busting.