I don’t want my Christian leaders (ordained or not) preaching politics to the flock. For me, they should be focused like a laser beam on the Gospel of Jesus Christ. Compared to the Gospel, politics are completely insignificant to me. You may feel different and you absolutely have that right.
I very much doubt tht Dobson regards himself as the pastor or "shepherd" of all the people who buy his books or listen to his radio broadcasts; nor do they regard themselves as his "flock."
Dobson, as an author and radio broadcaster, has as much right to advance his opinions as Greta Van Susteren or anybody else. He made it clear that he's not representing his church (which church, by the way? the Nazarenes?) nor even speaking for his own (secular) organization.
Do you see the difficulty that would result if every Christian man and woman were automatically de-legitimized as an opinion leader simply on account of the fact that he or she is a Christian?