President Obama unveiled a $3.8 trillion budget request Monday that hikes taxes on the rich, spends new money on infrastructure and education, but does little to reform the entitlement programs that pose the biggest long-term threat to the federal budget. "We built this budget around the idea that our country has always done best when everyone gets a fair shot, everyone does their fair share and everyone plays by the same rules," Obama said in his budget message. But the budget forecasts a deficit for fiscal year 2012 that will top $1.3 trillion, before falling in 2013 to $901 billion…