Stage an attack on the president and or his family.
Make sure the person that does it is for the constitutional rights of Americans, stands for freedom and is white.
(Ron Paul would be perfect)
At this point you can go one of two ways, if it looks like you can win the election, get Gabrielle Giffords to be Obama's running mate.
If it looks like you can't win, hype up the racial thing (white man shoots at black first family).
Start a race war/civil war, declare martial law, postpone the elections indefinitely.
Send your opponents to re-education camps.