To begin with, let's borrow from Charmed:

To Call Upon Our Ancestors

Prudence, Penelope
Patricia, Melinda...
Astrid, Helena
Laura and Grace

Halliwell Witches
Stand strong beside us
Vanquish this evil
from time and space

Using this template, substitute the names with those of your favorite presidents, such as illustrated in the following:

Washington, Jefferson
Lincoln, Roosevelt...
Roosevelt, Reagan
Carter and Obama

American Presidents
Stand strong beside us
Vanquish this evil
from time and space

For our highest and best
And to the detriment of none

Cast at least once a day, or as needed. If it can't be done in the actual presence of evil, during a live broadcast is an acceptable substitue. Spell may be preceded or followed by the Turkey Curse for added strength, efficiency, and effect. Or even a heart-felt

I can neither believe nor accept this shit!
FUCK!

Your mileage may vary.