Fighting the financial crisis has put the U.S. on the hook for some $5 trillion a report says. So far.

For all the fury over Treasury Secretary Henry Paulson's $700 billion emergency economic relief fund, it seems downright puny when compared to the running total of the government's response to the credit crisis.

According to CreditSights, a research firm in New York and London, the U.S. government has put itself on the hook for some $5 trillion, so far, in an attempt to arrest a collapse of the financial system.

The estimate includes many of the various solutions cooked up by Paulson and his counterparts Ben Bernanke at the Federal Reserve and Sheila Bair at the Federal Deposit Insurance Corp., as the credit crisis continues to plague banks and the broader markets.

The Fed has taken on much of that total, including lending a cumulative $1 trillion in overnight or short-term loans since March to primary dealers through its emergency discount window and making a cumulative $1.8 trillion available through its term auction facility, a series of short-term transactions it began making available twice a month in January. It should be noted that a portion of the funds lent in these programs has been repaid and that the totals represent what has been made available.

The Fed also took on tens of billions in debt, including $29 billion in debt of Bear Stearns, and made $60 billion of credit available to American International Group (nyse: AIG - news - people ). It is committing $22.5 billion to set up a special purpose vehicle to manage some of AIG's residential mortgage-backed securities, and it is financing $30 billion of a second fund to hold $70 billion of multi-sector collaterized debt obligations on which AIG wrote credit default swaps.

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The Treasury, in addition to the $700 billion raised in the Emergency Economic Stabilization Act, agreed to guarantee money market funds against losses up to $50 billion, will inject $40 billion of capital into AIG and is backing the conservatorship of Fannie Mae (nyse: FNM - news - people ) and Freddie Mac (nyse: FRE - news - people ), to the tune of $200 billion.

The FDIC, meanwhile, is guaranteeing $1.5 trillion of senior unsecured bank debt.

The most recent federal disclosure forms offer a stark reminder of Microsoft Corp.'s mighty Washington presence: The software giant's tab of almost $2 million for the third quarter alone nearly equaled the amount its rival Google Inc. spent in the first nine months of the year.

But Google already has spent more on lobbying this year than it did for all of 2007 as the Internet search company starts to emerge as a formidable player in D.C. lobbying circles.

The lobbying muscle of both companies was on full display in recent months as Microsoft and Google battled over Google's plans to sell some of the online advertisements that appear alongside search results on Yahoo Inc.'s Web site. Google and Yahoo entered into the partnership in June in an effort to keep Yahoo out of Microsoft's hands.

But Google walked away from the deal last week in the face of an antitrust challenge being prepared by the Justice Department. That retreat marked a key victory for Microsoft, which had mounted a major lobbying and public relations offensive to convince the government to block the agreement.

It's unclear whether the outcome would have been different without Microsoft's efforts as it was hardly alone in opposing the deal. Some of the nation's biggest advertisers also had warned that the partnership would drive up the cost of online advertising and cement Google's control over the market.

Microsoft had "the tail winds working in its favor," said Stanford Washington Research Group analyst Paul Gallant. But he added: "Microsoft played this about as well as it could be played."

Jeff Chester, executive director of the Center for Digital Democracy, a consumer advocacy group that opposed the deal, went even further. "It is possible that the Justice Department might have come to a different conclusion" had Microsoft not become involved, he said.

Indeed, it has escaped no one's attention that the Bush administration has allowed many big, controversial mergers to go through, including Google's recent purchase of online ad service DoubleClick.

While Microsoft and Google were on opposite sides in the battle over the Yahoo partnership, they have found themselves aligned in other big lobbying fights. The two companies led a recent push to open up "white spaces" -- the unused, unlicensed spectrum between television channels -- to deliver wireless Internet access. That effort paid off when the Federal Communications Commission approved the use of white spaces for broadband last week.

Google and Microsoft also have been key proponents of reforming U.S. patent laws to address a mounting backlog of applications and halt the increase in infringement litigation often driven by poor-quality patents.

In both cases, the companies have faced off against other powerful industries with deep pockets and well-established lobbying arms in Washington. In the white spaces fight, Microsoft and Google took on the National Association of Broadcasters. In the patent reform dispute, they have battled the nation's big pharmaceutical companies and other industries that want to leave the existing system intact.

Microsoft has had a presence in Washington for years -- which it beefed up significantly after becoming the target of a major Justice Department antitrust suit in the late 1990s.

The Redmond, Wash.-based company spent $6.9 million on federal lobbying during the first three quarters of this year, compared with $9 million in all of 2007, according to disclosure forms. The company easily outpaced Google and Yahoo combined in the third quarter -- spending $1.98 million, compared with Google's $720,000 and Yahoo's $570,000.

But Google is catching up. The company spent $2.1 million on federal lobbying during the first nine months of this year, compared with $1.5 million for all of 2007. And while not all big technology companies have chosen to play active roles in the nation's capital, Google wants to be a key participant.

"Google clearly appreciates the importance of engaging in Washington" since it has a lot at stake in number of critical policy debates, said Ed Black, president and chief executive of the Computer & Communications Industry Association. "Google has been ramping up at a rapid pace for a Silicon Valley firm."

The Mountain View, Calif.-based company opened its Washington office in 2005 and has hired people on both sides of the aisle to staff it. It has made an active effort to engage public interest groups and has hosted seminars on a range of issues at the Washington office. In addition, Google Chief Executive Eric Schmidt endorsed President-elect Barack Obama during the campaign.

Contributions by Google's political action committee totaled about $282,000 during the 2008 campaign, according to the Center for Responsive Politics. But that tally again was easily outpaced by Microsoft's $1.7 million during the same period.

Chester remains concerned that much of the corporate lobbying takes place behind closed doors -- even if it involves matters that have major implications for the public, such as the fight over the Google/Yahoo partnership.

"The issues of paramount importance to the public and the economy often get played out as fights between corporate behemoths," Chester said. "It's shameful that these digital giants have engaged in business-as-usual politics. It shows that our Internet policies are up for sale regardless of the consequences for consumers and competition."