First, destroy the economy by creating government corporations that separate risk from reward in the mortgage lending.  Then, force banks to make bad loans and have the government corporations buy some of them.  (But not all, because you want the banks to collapse too.  You just need enough to control the market.)  When you have driven the housing market to sky-high prices, let the bottom fall out.  The government will have to bail out the banks, and in doing so, the government can take over the banks as a condition for doing so.  Even better, put up a sock-puppet for President just as you engineer the collapse, blame the collapse on the other party so you get the sock-puppet elected, and you control the Presidency, too.

Socialism, here we come.  Brought to you by the Socialist Democrat Party.

Addendum: I neglected to mention one critical part of the plan — take over the public school system to create a populace too ignorant of economics and history to understand what you are doing.