WASHINGTON (AP) - Sen. Barack Obama, second to none in the race for campaign cash, raised more than $40 million in March and boosted his vast network of donors to nearly 1.3 million, the campaign announced Thursday.

The amount is less than the record $55 million he raised in February, but still a sizable amount that sustains his place as the fundraising leader among all presidential candidates. The money gives him a substantial financial advantage over Democratic rival Hillary Rodham Clinton as