Scarlett Johansson has denied reports she has "a crush" presidential candidate Barack Obama.
 
The actress has been accused of favouring Obama because of his good looks and rather than his policies, after voicing her support for the politician in his race for the White House.
 
But a source tells the New York Daily News that the rumours are just not true: "She is a surrogate (Obama campaigner). They're not exchanging love letters. Everyone seems to be forgetting that she's engaged.
 
"Kal Penn (actor and Obama supporter) is also a surrogate, and no one says he has a crush on Obama."
 
Johansson is currently engaged to Blade: Trinity actor Ryan Reynolds.