There's actually a fairly wide spectrum of opinion about Obama among American bishops. Only the most extreme conservatives would say it was wrong to vote for Obama. While American Catholic bishops are probably 100 percent opposed to abortion, some believe Roe v. Wade is here to stay, and it's time to start reducing the number of abortions by "changing hearts and minds" and by encouraging alternatives to abortion. It's just that the extremists are the ones who get the press coverage.
You will find a good number of Catholic priests and a huge number of nuns who supported Obama. The bishops tend to be more conservative - managers usually are.
Number 6 is correct in saying this:

Correct me if I'm wrong but I thought Roman Catholics as a whole supported Obama .... they object to the Dem's stand on abortion ... but support their policy in regards to the ending of the war, their stand on immigration, their stand on worker's rights, health care, and the Dems' commitment to the poor, and their stand on the environment etc.

But a fair number of bishops think that abortion trumps all other issues, even though the Republicans haven't ended abortion although they have held the White House for most of the time since Roe v. Wade.

-Joe-