I disagree. We have a president and no prime minister. The Senate members were originally established to represent the state governments to Washington. Parliament has nothing resembling that.
I should have clarified that while we have significant differences to parlaiment, the founding fathers set up a bicameral congressional house using parlaiment as an inspiration, because despite their problems with the King, they admired the system.
Assembing is unavoidable. Allowing political parties to set the rules within the very halls of congress is eminently avoidable, and should be stopped, imo.
Assembling is unavoidable, and in that assembling the groups will invariably name themselves, present a cornerstone of their beliefs, as well as a platform of issues that they stand by. When that occurs, and if there is enough numerical support, that group then has the power to influence if not out right control proceedings.
While we may not agree with that process it is historically inevitable, and the only way to garner change is to support a whole new group. I can imagine that the emergence of the tea party is one such example as they continue to gain support, and continue to seperate themselves from the more moderate republicans that they will become a viable(although unfortunately misguided) party of power.
And they'll only become valid if they are allowed into the mix. And round and round we go.
Another option would be to have candidates run, then have run-off elections for the top two candidates, without giving repub and dem party primaries the same status as general elections.
The Dems and Repubs control the government, they set the ways we do things. When the people begin to throw support behind a new group with different ideas, and they begin to garner some influence then things will change.
All-in-all I don't disagree with you about the ineffectiveness and general wrongness of the 2 party system we have now, or that the 2 parties are frankly causing the goverment to become locked down and inept. My singluar disagreement is that it would be possible to function without any political parties. They are inevitable as common thinkers will band together always.