A few advantages of the parliamentary system,

[Swede]

In Britain,Canada etc there are third parties that actually have some power in a minority government. Third parties also have voices during Question Period.

Although you wouldn't want the dozens of parties like Italy.

[TexasProgresive]

1. Even if a parlementary system is better in all ways

then our system what's the point of thinking about it. To change the US would have to:
1) Have a Constitutional Convention which could rewrite the Constitution. (with the current political atmosphere who would want that?).
2) Have a violent revolution (with the current political atmosphere who would want that?).

Feel free to add other possible ways to change our political system.

[Jennicut]

4. Yeah, it would be really hard to change it at this point.

I don't dislike a Parliamentary system at all. But rewriting the Constitution would get out of control fast. What I think is more likely is one of the parties (or both of them) splitting in two.

[Massacure]

2. Prime Minister Harry Reid?

I'll take Obama, thank you!

[depakid]

3. It would be Prime Minister Pelosi

You wouldn't have the 60 votes "gentleman's filibuster" (hence a robust public option, etc.) and unaccomplished junior Senators (or weak Texas governors) wouldn't lead the government.

Fact is, the US is structurally incapable of dealing with the challenges of the 21st Century- even when, as we have seen over the past 20 months, there's a massive mandate for change.