The measures he enacted in that period caused damage that lasted for decades. The explosive growth of crime in the United States more or less began with his creation of a vast welfare state and pro criminal activism from a liberal supreme court. By my back of an envelope estimate*, the explosion in homicide rates from the start of Johnson's "War on Poverty" up until welfare reform was passed 30 years later left around 200000 Americans dead. That's around 50 times as many Americans as have died in an actual war in Iraq.
Obama's voting record on crime suggests that he too is likely to to enact pro criminal legislation:
his eight-year voting record in the Illinois Senate shows the Democrat was on occasion an agent of isolation who took stands - particularly on anti-crime legislation - that put him to the left of his own party.Incidentally was anyone surprised to see that the man arrested for the massacre of actress Jennifer Hudson's family in Chicago should have been in prison at the time of the crime?
Mr. Obama was the only member of the state Senate to vote against a bill to prohibit the early release of convicted criminal sexual abusers; was among only four who voted against bills to toughen criminal sentences and to increase penalties for "gangbangers" and dealers of Ecstasy; and voted "present" on a bill making it harder for abusive parents to regain custody of their children, a Washington Times review of Illinois legislative records shows.
Obama is going to have big majorities in both houses of congress for at least two years, and will have the ability to cause lasting damage to his country. Seeing as how he isn't even a Clinton style centrist this is an opportunity he is likely to pursue. At least the press will keep a critical eye on him or a slobbering tongue on his backside.
* Assuming that the murder rate was an average of 3 per 100000 higher over that 30 year period and the US population averaged about 220 million in that period this makes the total number of excess homicides around 200000 (3 * 2200 * 30).