Same wikipedia entry:
“Roosevelt’s schism allowed the conservatives to gain control of the Republican party and left Roosevelt and his followers drifting in the wilderness throughout the 1920s before most joined the New Deal Democratic Party coalition of President Franklin D. Roosevelt.”
Well, just goes to show you you can’t trust Wikipedia. TR rejoined the GOP, became a huge national force in it again, and helped them temendously with his smash mouth politics against Wilson. So much so that he was considered in many GOP circles to be a good 1920 nominee. But he was in poor health and died in 1919, a GOP icon.