If memory serves last time he was primaried, he spent 23 million on just the primary. (Typically, a successful Senate candidate spends 10 million on the actual election.) So, he could be really unpopular and still get reelected.
Yes, but remember that he stole $18 million of that from his leftover 2012 coffers (unethically, and using a tactic that 'McCain-Feingold' would have banned).
Oops...meant 2008 coffers (McCain/Palin)