Unless Joe Miller is the nominee (which is certainly plausible) the GOP will pick up Alaska.
Landrieu is going down, the question is whether this race makes it to a runoff...
Hagan loses to almost everyone in the Republican field if the climate is as-is in November.
Booker won't win with 60% (probably more 56-58%) and Cornyn won't win with 70% (and probably not 60% either). In fact, I could see him struggle to hit 55% against Rogers, given Rogers is more conservative than he is.
Why are you so pessimistic?