First off, I can't see anything in that article to indicate that any of the Clintons have, as logger put it, become wealthy from the charity. The so-called scandal appears to have to do with the Clinton Foundation getting money from another charitable organization under questionable circumstances.
Second, the Clintons are not liberals. They are, at best, moderates. Over the last 40 years the political atmosphere of the US has become so absurdly distorted that what, in the 70s would have been considered very conservative is now considered moderate. Even people who are a bit right of moderate get labelled as communists now. Actual liberals look at the majority of the Democratic party, including people like Clinton and Obama, and just lament that these moderate-to-conservative people, who clearly are primarily focused on benefiting big business and the wealthy, are the best we can do. The only alternative is so-called conservatives who are actually little more than sociopaths trying to leach as much wealth as they can from the country before it goes completely bankrupt from their mismanagement.