Presidents Must Rely Heavily on the Power of Persuasion Because

 Presidents must rely heavily on the power of persuasion because they have 

A)  limited staffs. 
B)  to face inordinate resistance from within their own parties. 
C)  to spend their entire first terms campaigning for reelection. 
D)  vague constitutional powers and a lack of ensured legislative majorities. 
E)  All of these are correct.