Here is the enthusiasm gap:
90% reporting
Republican senate primary votes cast: 172,838
Democrat senate primary votes cast: 73,573
Republican president primary votes cast: 161,146
Democrat president primary votes cast: 57,148
Libertarian president primary votes cast: 232 (Gary Johnson kicked ass with 93 votes in case you were wondering)
Not that this means anything, really. McLoser won Nebraska very comfortably in 2008.