Seyfi Demirsoy is one of the localities of Altındağ; it had 5,889 registered voters at the 2011 parliamentary election.
The neighborhood parts ways with the district as a whole. At the 2011 parliamentary election it went to CHP with 51.8%, while across Altındağ the leading party was AK Parti with 62.8%, leaving CHP at 22.5%. At the 2010 referendum 69.5% of the neighborhood voted 'no'; across the district that was 32.7%.
The picture has not changed since 2009: CHP has finished first in all of the last 5 elections. At the 2009 local election the neighborhood went to CHP with 46.0%, while Altındağ as a whole was won by AK Parti.