Charles Krupa, Associated Press
Republican presidential candidate former Pennsylvania Sen. Rick Santorum thanks a Rockingham County, N.H. law enforcement officer during a campaign stop in Brentwood, N.H., Wednesday, Jan. 4, 2012.

MANCHESTER, N.H. — Relishing the momentum he's gained from Iowa, former Pennsylvania Sen. Rick Santorum is talking as if he's the Republican presidential standardbearer, focusing his campaign rhetoric on President Barack Obama rather than his GOP campaign rivals.

Santorum tells Rotarians in Manchester, N.H., in his words, "I don't think most Americans believe the vision of America that Barack Obama is selling."

Santorum, who finished just eight votes behind Mitt Romney in Iowa's precinct caucuses Tuesday night, also says "we have a president who doesn't understand us." He accuses of Obama of having run "roughshod" over the constitutional separation of powers doctrine by installing a new head of a federal consumer protection agency without getting the Senate's approval.

The former senator chastises Obama, saying "you are not above the law, Mr. President."