I actually don't think it would be that far off to have Adam Smith a supporter of government intervention. His philosophy is often misinterpreted. In the ideal Smithian world, everyone would be constantly educating themselves to perform a single task better and better, till each person had a unique, indispensible role in the economy (I'm serious).
He was also a big enemy of corporations, as he thought that any time anything more than an individual gets together for the purpose of investment or otherwise, it's a restriction upon the free market.
His chapter on poor laws in England is interesting, as is where his anti-interventionist stance arose. Basically, the existing poor laws at the time not only were unlikely to be enforced properly, as they were left up to parishes, but they stopped the poor from one town being able to find work in another.
Essentially, Smith was born too early to have any models of well-working interventionist government. If there was some vaugely welfare state model during this period, he might come up with a different model, but you would need that POD first.