Vallicella on "the dog barked"

Bill Vallicella at Maverick Philosopher writes "The past-tense proposition that the dog barked... is in dire need of a truthmaker. There is need of an ontological ground of its truth."

The validity of "the dog barked", for the Presentist, could come from the present mathematical model that's an extrapolation of present causation. 

Reference: [maverickphilosopher] William F. Vallicella: Presentism and Causation: A Question for Alan Rhoda at http://lists.powerblogs.com/pipermail/maverickphilosopher/2005-December/000901.html.