political plant but did a new campaign speech help democrat alvin greene gain new supporters in his bid to become south carolina s next u.s. senator? i m wolf blitzer. you re in the situation room. let s get back to our top story this hour. another 24 hours of testing now under way on the new well cap in the gulf of mexico. officials are keeping close watch on pressure readings and possible leaks but so far the incident commander thad allen says no significant problems have been detected. it s been four days since the cap shut in the well and stopped the oil that had been gushing since april. still, protesters are planning to gather right here in washington tomorrow exactly three months after the rig explosion that unleashed this disaster. mary snow has been monitoring a hearing today on the cause of the explosion. mary, i take there were some fireworks. there were, wolf. these are hearingsconducted by