user: Question: Who led team classification during the stage whose winner was Chris Horner?
Columns: ['Stage', 'Winner', 'General classification', 'Points Classification', 'Mountains Classification', 'Sprints Classification', 'Team Classification']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Alejandro Valverde Óscar Freire', 'Alejandro Valverde Óscar Freire', 'Alejandro Valverde Óscar Freire', 'Gonzalo Rabuñal', 'Christian Meier', 'Team RadioShack']
SQL:

assistant: SELECT "Team Classification" FROM "Table" WHERE "Winner" = 'Chris Horner';