I’d like to echo that, BobLibDem.
Please understand me.  I concede that I’m a quite partisan Republican and a generally conservative guy.  But I have a great interest in a strong Democratic Party, one in touch with the voters across the country, and genuinely responsive to the country’s needs.
The Democrats have a serious credibility problem when it comes to national security.  This bothers me, because it wasn’t always so.  Had Adlai Stevenson been elected in the 1950’s, he would have been a staunch Cold Warrior.  Anybody that doubts this can look at the record of the Democratic presidents before and after his presidential bid.
Trumanesque and Kennedyesque Cold Warriors (indeed, Democratic warriors of any stripe) have become an endangered species.  Moynihan is dead and buried, as is Scoop Jackson.  John C. Stennis is gone as well.  The Democrats who assumed national prominence after these men are not natural and reflexive defenders of America and American ideals, like these men were.
I don’t for one second, though, believe that Democrats like Ted Kennedy, Mondale, or Carter enhanced our nation’s security through their efforts.  They did succeed, though, in reforming the party to fit their image.
The party also seems to have a real interest in perpetuating racial struggle instead of reconciliation.  This is borne in part out of well-meaning policies that haven’t had purely beneficial effects, like affirmative action.  It is also due in part to a cynical attempt to keep others upset about racial issues, in the belief that those that feel slighted by American society will always vote Democratic.
I come from a predominantly Democratic area, and most of my family are Democrats.  I’m in many ways a natural Democratic voter - blue collar background, union household, etc.  What turned me off about the Democrats at the outset of my voting career, at least in the Pittsburgh area, was the rather casual attitude they had about corruption.  Democrats in that area were quite corrupt, but could be counted upon to whitewash each other’s activities.  The only time corruption ever became a campaign issue was if the rare Republican were caught, or if a primary fight got truly nasty.
I realize that the Republicans aren’t saints.  But the fact remains that Nixon left office after his Republican support in Congress evaporated.  Clinton, OTOH, remained in office because his Democratic support held firm.
My affiliation has hardened to the degree that I’ll likely always be a Republican.  Faced with a party I no longer fit in with, I’ll likely work to change it rather than switch.  Please know, though, that the reason I’m a Republican today is because the Democratic Party chased me away.  They’ve lost me, and lots of others like me, and probably for good.
That is a big reason why the Democrats went from a majority to a minority party is litle more than a generation.  Change back to Truman and JFK Democrats, and you have a shot at reversing this.