an estimate of the size of the oil spill in the gulf of mexico. one expert saying close to 3 million gallons of crude oil may be gushing out of that well each day. we'll get the very latest on the disaster from the coast guard commandant admiral thad allen. also, dark clouds on the political horizon for some democratic incumbents will they survive next week's primary election? candy crowley, are both standing by live. they'll give us their insight into some critical races. and my candid one-on-one interview with the former first lady of the united states, laura bush. her surprising views on abortion, gay marriage, and what she hated about her public image. i'm wolf blitzer on the cnn express here in dallas, texas. we want to welcome our viewers in the united states and around the world. you're in "the situation you're in "the situation room." -- captions by vitac -- www.vitac.com there's new concern that the oil disaster unfolding in the gulf of mexico right now may be