Talk about election buzz. What does Steffen Schmidt, also known as 'Dr. Politics', think about the Republican campaign and Iowa caucus vote scheduled for Jan. 3? Mr. Schmidt, who is also a political science professor at Iowa State University in Ames, has been following Iowa presidential campaigns for over 40 years, and it's fair to say he's buzzing with excitement and anticipation. The Globe asked him: Why has this Iowa campaign been so memorable?