"Democrats fall in love ; Republicans fall in line." These political statements tell the truisms of party affiliation.
Democrats need a person to vote for that they can truly love and that they can adore and vote for.
Republicans, rather, need party chiefs who choose a standard bearer that the rank and file voters can accept and vote for.
One party relies on the magnetism of the person that they believe will fill the job contested for and fill it properly.
The other party relies on the mechanics of party operatives to pick a person to lead the party and win the election.
Ronald C. Downie