@joefromchicago,
Your criterion of being registered in all states is a pointless quibble--whether Douglas or Breckenridge, the Democrats won no state that was not a slave state. Bell won the only slave states which weren't won by a Democrat. Lincoln won all of the free states. Obviously the important issue was slavery, and the vote divided along those lines. Who was registered on the ballot where seems to me to have had little significance. I don't know if the Republicans even bothered to try to get on the ballot in slaves states--but whether they tried and failed, or just didn't bother, is not important. I don't consider that you've made a case that the Democrats were the only national party. After all, Ross Perot in 1992 was on the ballot in all the states, but failed to win a single state in the Electoral College. Being on the ballot doesn't mean anything if it doesn't get to your goal.
Whereas the state of political affairs in Canada, England and France may be consistent with your position as outlined in that thread from four years ago, it is not consistent with the general claim that first past the post electoral systems inevitably lead to two party states. I'm not suggesting that you are obliged to defend a position you haven't taken. But i wasn't responding to your position is a long ago post. I was from the outset objecting to the first past the post position taken by RG, or at least as i understood it to be the position he had taken.
But i won't be churlish about it . . . you're right, Bubba, i'm sure you are . . .