Question:
Which political party did Andra Veidemann belong to in Dec, 2010?

Context:
 Andra Veidemann is a member of the People's Union of Estonia from Jan, 2000 to Jan, 2009. 
 Andra Veidemann is a member of the Estonian Liberal Democratic Party from Jan, 1990 to Jan, 1991. 
 Andra Veidemann is a member of the Social Democratic Party from Jan, 2009 to Jan, 2018.

Answer:
Social Democratic Party