It, at the very least, slows down the downward spiral. And if you're lucky then future candidates start to notice the trends that generate votes and begin to adopt those policies (still with new minor differences that you must once again weigh the pros and cons of). Rinse and repeat. They're not exactly the same, so you pick one over the other.
In an ideal world, this is how it might work. Do you see current candidates working off of previous trends that were successful? Just one: they all know that in order to get in office, they have to tell the public what they want to hear. That's it. Harsh realities and brutal honesty don't win elections. To make matters worse, the American public are pretty dumb and easily influenced by neatly-packaged bullshit.
Once in office, confounding factors kick in and it's another impotent story altogether.
IMO, one of the biggest obstacles to any kind of progress is "party loyalty". Unfortunately, it's so entrenched in our culture that I don't know if it's possible to change it.
It's amazing how any other time of the year this forum is full of topics arguing over if X person is doing or did good and if Y person would have been better or worse, but once election time comes around some of those same people are suddenly saying they're all the same. I guess McCain would have given us the same healthcare bill we got with Obama. They're all the same.
Health care reform under a Republican president absolutely would have been quite similar to what we got from Obama. His bill is so castrated and watered down that it doesn't even satisfy his own party, and that's exactly the type of legislation that would have come from a McCain presidency. Everybody in this country knows that we need health care reform, and the party gridlock regarding the "how" (among other things) will keep anything effective from being passed. They're all the same.
And if you're referring to me with the first part of that, I don't make a habit of posting in X vs. Y type topics, and I'm not sure where I've changed my tune with regard to all of this.
-J