Celebrity political endorsements are losing their pull with American voters, a blow to Hollywood's clout but a sign that stars are starting to accept it.

• Jennifer Lawrence recently said she has realized Americans do not care about celebrity endorsements and is backing off.
• The bigger shift: stars who once expected to move votes now find they cannot.
• Public reaction has turned against celebrity political lectures, and many stars are being mocked rather than followed.
• The upshot is that campaigns get less value from big-name backers than they used to.

Outlook: Expect fewer celebrity endorsements in the next election cycle as stars pull back from politics.