@JPB,
Interesting, and although I respect your opinion because I used to think similarly, I think political parties are necessary and advisable to help define basic philosophies and platforms. I realize individual politicians vary somewhat from party platforms, as they should, but I do not think they should stray completely off the reservation, because after all that is why we have parties.
I have to shake my head a little when I hear people say I vote for the person, not the party, because although it sounds good, when a Democrat gets to Washington, the party will browbeat them into walking the party line, and I think what is going on right now is highly illustrative of that. Having a politician belong to a party also helps identify where his or her true beliefs actually reside, and it also helps voters better identify what that person may support or oppose when they get to Washington.
I identify myself as a conservative, and although registered as Republican I am not at all always happy with the Republican Party. I do lean toward that party simply because the Democrats seldom if every support the policies that I support, so I figure the Republicans are my best hope of seeing things happen that I agree with, and I figure that any tiny influence I might have is better attained through the party than as an independent.
By the way, my parents were lifelong Democrats, but seldom voted for the Democrats on the national scene in the past 20 years or more. I think the party left them, they did not leave the party. The Democratic Party in my opinion has gotten so extremely leftist and far out, that many of its beliefs are really far fetched.