Why the leftist love for TR? Parker ran to his left.
Um.........
Having lost the 1904 election badly with a conservative candidate, the Democratic Party turned to two-time nominee William Jennings Bryan, who had been defeated in 1896 and 1900 by Republican William McKinley. Despite his two previous defeats, Bryan remained extremely popular among the more liberal and populist elements of the Democratic Party. Despite running a vigorous campaign against the nation's business elite, Bryan suffered the worst loss of his three presidential campaigns.
http://en.wikipedia.org/wiki/United_States_presidential_election,_1908