Another interesting fact is that we all seem to stick with our parties through thick and thin, even if they would be considered liberal/conservative by todays standards (Fremont and Lincoln as liberals, Jackson and WJB as conservatives).
To a degree, yes. I don't do that as much, voting Whig 1836/1840 and 1848/1852, then GOP from 1856-1880, Populist 1892, GOP 1904, Progressive in 1912 and 1924, then GOP in 1952-1956, 1972, and 1984. A lot of the time, still though, there is agreement between the poster's current party and their past votes.