I think many of you are missing what Bill Clinton was trying to do here and what Hillary needs to do if she is going to win against Trump.
Trump is on the verge of taking over the machinery of the Republican party because for years it has not done anything that it was supposed to do. Hillary will have a big problem winning against Trump because everything that Trump has done to take over the republican party machinery, will be devastating to Hillary's election campaign.
1: At first it would seem to be insane for Bill to be attacking Obama, but there is a logic to it. One of the reasons that Trump is winning is because Trump is perceived to be a political outsider and against everything that Obama is for. Running Hillary as being a continuation of Obama is probably a losing strategy for the campaign, hence the reason Bill now attacks Obama and his polices.
2: Hillary does not want to be seen as being with Obama on his foreign policy disasters. The whole situation in Syria was due to the failure of the administration to bring a quick end to the possible Arab Spring type of revolt. In the early stages if the administration had moved fast they might have been able to topple Assad and win. Instead, the administration didn't seem to know what to do, and wavered even after ISIS formed and almost swept everything before them. Then on top of the disaster, Putin got in and within a few months pounded ISIS to the point where it was on the run. Putting Hillary in as Sec of State in the Obama administration was supposed to give her 'foreign policy experience' and help her next run for president. Instead, she now needs to distance herself from the disaster that is growing in Syria and the region.
Another fallout from the failure to being the situation in Syria to any quick conclusion, is the oil price war that is going on between Saudi Arabia, Russia and Iran. Saudi Arabia is pumping as much oil as possible to ruin the oil export earnings of Russia and Iran. A side effect is that is has also bankruptcy much of the USA oil and gas industry with a number of companies going bankrupt or about to go bankrupt. If voters in the oil patch areas realize this there is no way Hillary gets their votes. (North Dakota, Oklahoma, Texas, Pennsylvania, etc. all big oil and gas states)
3: There was a time in the early part of her campaign that they tired to run the 'Obama didn't go far enough'. They were going to try to sell the idea that Obama, by de facto nationalizing health care through the ACA (Affordable Care Act) with health care being 1/6 of the USA economy, just wasn't enough government control over everything and that more government control of everything was needed. i.e. Elect Hillary and we will have the government take over more of the economy. The problem is that many people can't afford the deductibles under the ACA health plan so the plans are useless if the family need it because they can't pay the $2K or $4K or $6K. In my options for health coverage I saw the ACA coverage levels, referred to as Bronze, Silver and Gold; and was appalled at the coverage. Anyone who couldn't afford health insurance and had to pick one of the plans probably would not have the money to pay the deductible if they had a bad health problem and needed to use the insurance. So what good was it?
Hillary needs to distance herself from this because more and more people discover that the health plans are no good because the high deductibles means that in effect, they really don't have any health insurance.