Ethnic differences in Iran?

With the Iranian election and the protests there are occasional references to ethnic groups in Iran. For example, Mousavi did not do as well in Azerbaijan as one would expect knowing that he is an ethnic Azeri Turk. The father of the Grand Ayatollah Ali Khamneini is also an Azeri Turk. So despite the fact that ethnic Persians, who speak Farsi, are the dominant group in Iran and to a large extent define its national identity, minorities have prominent roles. Iran is about 50% Persian and 25% Azeri Turk, with the balance being defined by a host of other groups such as Kurds.
But does this matter? The World Values Survey done in 2005 in Iran had a breakdown by language. So one can examine to see if there are any differences between Azeri Turks and Persians. I didn’t really find much at all. Below the fold are a a range of responses to various questions.