Feinstein is a bulletproof Douche bag politically. She will either Die in office or retire.
That's the way most senate seats are. It's either because they all do such a good job or the system is corrupt
It's getting harder and harder to unseat an incumbent period, even in non-lefty-loony states and districts. Look at McKinney: ousted in 2002, back in in 2004. But senators especially. Unless they do something (a) illegal or (b)totally off the wall. Boxer and Feinstein will be like Ted K and Byrd. Look at Murray and Cantwell in WA. Even Murray's hare-brained statements about Osama's day care centers doesn't effect the voters.
One reason why the Maryland Senate race is so interesting this year. Sarbanes is stepping down and Steele (R) has a real chance to win. Now if only Mikulski would follow suit.....