Visiting the samadhi of the great Mahatma is a protocol followed by even Bill Clinton, Musharraf and many other leaders.
That Saudi king is a wahabbi terrorist. If he didnt attend, then its HIS loss.
If Dubya doesnt attend, then he has NO reason at all, because his predeccessors have. He is just appealing to "religion" to increase his approval ratings back home amongst the Catholix.