We have our episode description for episode 5 of Book 2 "Peacekeepers" [caption id="attachment_8101" align="aligncenter" width="600"]Raiko, President, Republic City, United Republic United Republic President, Raiko[/caption]
"When the president of the United Republic refuses to help Korra, she decides to take matters into her own hands."
Source As you can see from the picture we have actually seen the president before, in the opening newsreel from Rebel Spirit. Bryan has since mentioned that his name is Raiko. It will be interesting to see what his reason is for not helping the Avatar and how good of a president he is, is the city better with him in charge. Thoughts?