It wasn't. It was passed under Bush. And Democrats were just as likely to mess that up as Republicans:
Just 36% of Republicans, 35% of independents and 34% of Democrats know that the government bailout of banks and financial institutions was signed into law by former President Bush. Democrats (46%) are just as likely as Republicans (50%) or independents (44%) to incorrectly say the legislation was enacted after Obama became president.
Weirdly, the biggest gap between each party's news awareness was the depth of the oil leak. The other gaps are practically margin-of-error differences.
Take the quiz yourself at Pew Research.