Oinkbama's housing theories...

As a state senator, the presumptive Democratic presidential nominee coauthored an Illinois law creating a new pool of tax credits for developers. As a US senator, he pressed for increased federal subsidies. And as a presidential candidate, he has campaigned on a promise to create an Affordable Housing Trust Fund that could give developers an estimated $500 million a year.

But a Globe review found that thousands of apartments across Chicago that had been built with local, state, and federal subsidies - including several hundred in Obama's former district - deteriorated so completely that they were no longer habitable.

Grove Parc and several other prominent failures were developed and managed by Obama's close friends and political supporters. Those people profited from the subsidies even as many of Obama's constituents suffered. Tenants lost their homes; surrounding neighborhoods were blighted.

Some of the residents of Grove Parc say they are angry that Obama did not notice their plight. The development straddles the boundary of Obama's state Senate district. Many of the tenants have been his constituents for more than a decade.

"No one should have to live like this, and no one did anything about it," said Cynthia Ashley, who has lived at Grove Parc since 1994.

Obama's campaign, in a written response to Globe questions, affirmed the candidate's support of public-private partnerships as an alternative to public housing, saying that Obama has "consistently fought to make livable, affordable housing in mixed-income neighborhoods available to all."

The campaign did not respond to questions about whether Obama was aware of the problems with buildings in his district during his time as a state senator, nor did it comment on the roles played by people connected to the senator.

Among those tied to Obama politically, personally, or professionally are:

Valerie Jarrett, a senior adviser to Obama's presidential campaign and a member of his finance committee. Jarrett is the chief executive of Habitat Co., which managed Grove Parc Plaza from 2001 until this winter and co-managed an even larger subsidized complex in Chicago that was seized by the federal government in 2006, after city inspectors found widespread problems.

Allison Davis, a major fund-raiser for Obama's US Senate campaign and a former lead partner at Obama's former law firm. Davis, a developer, was involved in the creation of Grove Parc and has used government subsidies to rehabilitate more than 1,500 units in Chicago, including a North Side building cited by city inspectors last year after chronic plumbing failures resulted in raw sewage spilling into several apartments.

Antoin "Tony" Rezko, perhaps the most important fund-raiser for Obama's early political campaigns and a friend who helped the Obamas buy a home in 2005. Rezko's company used subsidies to rehabilitate more than 1,000 apartments, mostly in and around Obama's district, then refused to manage the units, leaving the buildings to decay to the point where many no longer were habitable.

Campaign finance records show that six prominent developers - including Jarrett, Davis, and Rezko - collectively contributed more than $175,000 to Obama's campaigns over the last decade and raised hundreds of thousands more from other donors. Rezko alone raised at least $200,000, by Obama's own accounting......