First, here's the wiki on ACORN which seems pretty fair and accurate for the most part.
http://en.wikipedia.org/wiki/Association_of_Community_Organizations_for_Reform_NowNow look at all the issues that ACORN has focused on - voter registration, living wages, non-predatory lending, exposing redlining, etc. etc. A veritable cornucopia of topics that the Rightwing would like to bury for good.
The voter fraud practiced by low level ACORN employees stupidly paid by the registration was relatively small potatoes in the grand scheme of things, with many of the fraudulent registrations being exposed by ACORN themselves. Not to excuse ANY voter fraud, but it does not turn elections. What DOES turn elections is ELECTION FRAUD! Unexplainable results, which do not match exit polls, where bizarre and inexplicable outcomes occur which are rarely if ever investigated - proprietary private software owned by Republican corporations, etc. etc. Or how about nice phone jamming schemes as practiced by Republicans in New Hampshire? Election fraud does not get covered because the rightwing media machine would much prefer to focus on and scapegoat ACORN which has been a big vehicle for getting minorities to the polls. We don't want that, though, do we?
As to mortgage fraud - it was a grand scheme orchestrated and perpetrated by the banks and Wall Street in collusion with their "securitized" insane mortgages which were then insured with the credit default swaps, threatening to bring down the entire world economy, and which still hasn't been resolved. BUT, let's instead focus on the amount of mortgage fraud which filtered through Fannie and Freddie (20% of the total) and blame it on the Community Re-investment Act which was passed in 1977 for cripes sake and which ACORN supported and defended and which all of rightwing media blamed for the entire bank collapse.
As others have pointed out, the criminal acts of some has not deterred our government from handing out lucrative contracts to many private companies, defense contractors, etc. Yet our spineless Senate will roll and capitulate immediately and renounce all funding for an organization that has done a lot of good work over the years. Only 7 votes against this hair-trigger, reactionary response.!
And right now, the Right is on a BIG PUSH to make ACORN and President Obama synonymous. I heard Rush Limbaugh on Tuesday proclaim that "ACORN is Obama and Obama is ACORN" pushing the subtext that ACORN is a criminal organization that illegitmately helped put a usurper in office - my interpreation of the subtext of his comments. This is an appeal to insanity and hatred that is not supported by any rational reading of the facts.
It's too bad that ACORN had the misfortune to have some very bad and stupid employees that will probably bring down their entire organization and the worthwhile work that it did do.