MIDDLEBURY, Vt. — They sometimes refer to themselves as “campaign tourists” as they bounce around to campaign rallies around the country. Middlebury political science professors Matt Dickinson and Bert Johnson, both experts in electoral politics, have seen a lot already and the primary season is just heating up.

Following the highly anticipated Iowa caucuses, Dickinson and Johnson talk about some of the particular challenges that pollsters face now, and how polling differs between a caucus and a primary. And, with New Hampshire hotly contested in both parties, they look at what lies ahead for the candidates as they move east.

Dickinson authors the blog Presidential Power and is frequently quoted in the national media. He often live tweets political events at @MattDickinson44. Johnson, also a regular in the national media, tweets at @bnjohns.