- Jokowi and economical liberalism
You seem to equal "fighting against corruption" with "laissez-faire liberalism". They are not the same thing at all (some people would even argue than laissez-faire liberalism encourages corruption... a totally different debate). Some welfare countries have a very low level of corruption (say, Sweden).
In any case, beside fighting corruption, Jokowi's politics cannot be considered as economically ultra-liberal: he introduced a universal health care system, tried to develop public transportations and upheld several environmental regulations, notably banning new palm oil exploitations.
Most often policies to reduce corruption are popular with poor people (which strongly correlates with uneducated people).
Who was (and still is) profiting the most from corruption ? Not the uneducated people. Who suffers the most from corruption ? Probably the uneducated people.
Finally, one should note that poor people were the electoral base of Jokowi to begin with, notably because he made poverty one of his major themes during the 2014 campaign.