The implication of your thread title and your commentary post would lead one to believe that the two representatives in question have grown disillusioned with their party, the truth is somewhat more mundane and personal.
While Cubin narrowly won re-election the last time around, her reasons for not seeking another term are quite reasonable:
Cubin has missed almost half her votes this year as she has been in Wyoming tending to her husband, who has been ill for many years with an unspecified immune disorder. Dr. Frederick "Fritz" Cubin has been hospitalized repeatedly in Casper this year, often in critical condition.
She has also missed votes this year following her brother's death and after she broke her foot.
"It has been an extraordinarily difficult year for our family," Cubin said in an interview last month.
As for New Jersey's Jim Saxton, said he won't seek re-election because he's being treated for prostate cancer.
"Although I intended to run in 2008 and was planning a strong campaign, developments which occurred earlier this year regarding my health have prompted me to make this decision," Saxton said.
Saxton spokesman Jeff Sagnip said Saxton was diagnosed in late spring with prostate cancer and is also being treated for chronic sciatica, a painful back and leg condition.
Saxton said he plans to serve out his current term.
"I will continue to receive medical treatment and my health care providers have indicated the prognosis is, in fact, very positive," Saxton said.
Neither of the people the article discusses mention anything about the current state of their party, both are respected by members of both parties, and both are getting out for personal reasons.
While you may believe that the GOP is a "sinking ship," the reality is quite different. Though there are obvious problems that need to be addressed, the same can be said of the Democratic party and politics in general. I've said it before and I say it again now, the GOP and the DNC are two sides of the same coin. Six of one, half dozen of another. Members of both parties are only interested in three things: getting power, keeping power, and making money from both.
If the Republican's ship is sinking, so is the ship the Democrats are sailing. The question is, who can bail the fastest?
"I am allergic to piety, it makes me break out in rash judgements." - Penn Jillette
"I have never killed a man, but I have read many obituaries with a lot of pleasure." - Clarence Darrow
"The man who invented the telescope found out more about heaven than the closed eyes of prayer ever discovered." - Robert G. Ingersoll