Obama, Risch Sali Win Idaho Mock Election

Item: Obama Nips McCain by 2% in high school mock vote /Betsy Russell, Eye On Boise Secretary of State results here.

United States President
CON Chuck Baldwin 46 1.0%
LIB Bob Barr 73 1.6%
REP John McCain 2,135 45.6%
IND Ralph Nader 189 4.0%
DEM Barack Obama 2,240 105 47.8%

United States Representative
DEM Walt Minnick 1,337 47.2%
REP Bill Sali 1,497 160 52.8%

Question: how do you explain these mixed results in statewide balloting of Idaho high school students?