USSC Associate Professor David Smith speaks to ABC Drive about former president Trump's significant 30-point margin of victory at the Republican caucuses in Iowa.

"If you look at the last couple of times Iowa had a competitive caucus, Ted Cruz won it in 2016 and Rick Santorum won in 2012. The difference is that, this time, Trump is almost like an incumbent president... This is the biggest victory anyone has ever had in the Iowa caucus in a competitive race."