Reelection

Look at Obama's net worth when he left office and now.

Look at Bill Clinton's net worth when he left office and now.

It wasn't the final stage of their career but only the beginning.

A presidency lasts 8 years of your life, best case scenario. And the presidential salary will not make you rich. So, if your only goal is a good life, you have to use your presidency to get people to make you rich afterwards, which means favors for the wealthy.

They run from the left in order to get elected, that is the sham. They tell people things that people want to believe that they know they can't deliver in order to get elected.

Then they govern from the centre right status quo which aligns more with their actual beliefs.