German Chancellor Angela Merkel scraped through a parliamentary vote endorsing a second bailout for Greece on Monday but faced a growing backbench revolt against pouring in more money in support of the euro zone.
The 496-90 victory, with five abstentions, was inflated by center-left opposition support, but only 304 of Merkel's 330 centre-right coalition lawmakers backed the motion.
The Bundestag lower house voted shortly before Standard & Poor's cut Greece's long-term credit rating to "selective default", becoming the second agency to downgrade Athens after it announced a bond swap plan to lighten its debt burden.
Seventeen coalition rebels voted "No" this time, compared with 13 who defied Merkel last September in a vote to boost the euro zone rescue fund.
Analysts said the outcome could weaken her politically and make it harder for her to agree to strengthen Europe's financial defences just when international pressure on Germany is rising.
"Merkel is losing her powers to convince, and the members of the Bundestag are losing their belief that everything will go according to plan," said Gero Neugebauer, a politics professor at Berlin's Free University.
The world's leading economies in the G20 piled pressure on Berlin at the weekend to drop its opposition to a bigger European bailout fund, telling Europe it must put up extra money if it wanted more help from other countries.
European Commission President Jose Manuel Barroso added his voice on Monday, saying he expected a decision on strengthening the euro zone's financial firewall during March, although not at an EU summit on Thursday and Friday.
The chancellor, whose country provides the lion's share of the emergency funds, stood firm on the issue in an effort to ensure a convincing vote in favour of the 130-billion-euro ($175 billion) rescue programme for Greece, its second since 2010.
Opening the debate, she acknowledged there was no 100 percent guarantee that the bailout would work, but rebuffed calls from rebels to let Greece default and leave the euro.
"Nobody knows what would be the impact of rejecting the second Greek aid package on the other bailout countries, Portugal and Ireland, or on Spain and Italy, or the entire euro zone and the world," Merkel said.
"As chancellor I have to take certain risks, but I cannot be reckless - my oath of office forbids that."
She called for speeding up payments into a 500-billion-euro permanent euro zone rescue fund so that it is fully capitalised within two years instead of five, and said her government saw no need to debate a bigger overall safety cushion now.
"With the voluntary debt restructuring for Greece we are entering new territory. If it is a success, then the contagion risk for other countries will be further reduced. Now we need to wait and see what happens," she said.
Greece formally launched the bond swap on Friday, under which private creditors will suffer real losses of around 74 percent on their Greek debt holdings.
If enough creditors agree to take new, lower value bonds in return for existing debt, Greece will have the power to force any creditors who do not sign up voluntarily to the deal to accept its terms under "collective action clauses".
This prompted S&P to follow the Fitch agency, which cut Greece's long-term ratings to its lowest rating above a default last week.
"We lowered our sovereign credit ratings on Greece to 'SD' (selective default) following the Greek government's retroactive insertion of collective action clauses," S&P said.
However, the move had been widely expected and S&P said that once the debt exchange was concluded, it would probably raise Greece's sovereign credit rating to the 'CCC'.
Merkel faces growing resistance to further bailout spending from public opinion and influential media.
"Billions for Greece - Stop!" Germany's best-selling newspaper Bild screamed across its front page.
"Don't go any further along this crazy path," it said, quoting leading economists who argue Greece would do better to default on its huge pile of sovereign debt and temporarily leaving the single currency.
For the opposition, Social Democratic (SPD) former finance minister Peer Steinbrueck said Merkel's "strategy of buying time has failed, because things have got worse and worse.
"Nearly two years after the first Greek aid package in May 2010, we are back to square one regarding Greece, regarding the risk of contagion to the euro zone, and regarding Germany," Steinbrueck said.
"Not only has the bill become more expensive but resentment and prejudice have grown considerably as well, with clichés about lazy Greeks running alongside images of ugly Germans."
Merkel has faced frequent sniping from critics of euro zone bailouts among her conservative Christian Democrats, the Bavarian Christian Social Union and the liberal Free Democrats.
The backbench revolt, coming on top of a humiliating setback over the nomination of a new federal president, may raise questions about her coalition's survival until elections due in 2013, when she is expected to seek a third term.
Facing huge domestic pressure to make sure Germany's euro zone partners get aid only in return for tough fiscal reforms - which Greece has failed to deliver - Berlin has sent conflicting signals on whether it will soften its stance.
Finance Minister Wolfgang Schaeuble, meeting G20 colleagues in Mexico this weekend, appeared open to merging the euro zone's temporary and permanent bailout funds to create a 750 billion euro ($1 trillion) war chest. This would open the door to extra International Monetary Fund (IMF) support as well.
Merkel's "wait and see" line did not rule out a change of course next month, but the vote makes that more difficult.
GERMANS LOSING PATIENCE
Merkel's caution is driven partly by voter concerns and unease within her coalition, but also by a feeling in Berlin that market pressures are easing and there is no longer an urgent need to put up more money.
In fresh signs that the European Central Bank's move to flood banks with cheap three-year liquidity has helped stabilise bond markets, Italy and Belgium saw their borrowing costs sharply reduced at debt auctions on Monday.
But safe-haven German Bund futures hit a five-week high with traders citing Merkel's doubts about the success of the Greek rescue and her forecast of years of toil for the euro zone.
Ahead of a second injection of long-term cheap ECB money expected to total 500 billion euros on Wednesday, the central bank said it had kept its emergency government bond-buying programme dormant for a second straight week.
An opinion poll published in a Sunday newspaper found 62 percent of Germans were against the second Greek rescue package while 33 percent were in favour. In a similar poll in September, 53 percent had been opposed and 43 percent in favour.
Germans are growing impatient with what Schaeuble has described as a "bottomless pit" in Greece.
Frank Schaeffler, the loudest eurosceptic among the Free Democrats, the struggling junior partners in Merkel's coalition, told parliament: "Greece has no chance of becoming competitive in the euro zone and it must therefore leave, and this must be accompanied by a real debt haircut worth of the name."
At the same time, there is a growing awareness in Germany, Europe's leading economy, that its own prosperity is at risk as the debt crisis sucks in more countries and stifles demand the currency bloc for German exports.
German criticism of Greece has reopened wounds dating from World War Two. Protesters in Athens burned a German flag earlier this month while Greek newspapers have portrayed Merkel and Schaeuble in Nazi uniform.
Despite riding high in polls, Merkel has hit a rough patch - about 18 months before the next election - that has raised doubts about her grip on power.
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