suraya fadel for cbs news. >>> nearly a week after isaac blew through the gulf coast, more than 100,000 people are still without power in louisiana and mississippi, and some low-lying areas are still under water. president obama visited a parish hit hard by hurricane isaac on monday. he promised federal help with the recovery. on friday during his tour of the area, mitt romney spoke of the need for charitable donations. manuel bojorquez has more. >> reporter: six days after making landfall, isaac is the uninvited guest who just won't leave. in plaquemines parish, the flood devastated lives and livestock. 62-year-old carolyn sylve and her daughter have to take a canoe to see what they could salvage. >> this is our land, you know. you want to be home, but you can't. >> reporter: while the reinforced, $14 billion levee system kept new orleans dry, the coplaint here is it pushed more water into the smaller, poorer towns. >> we're getting ready to get washed away here. >> reporter: isaac walloped plaquemines parish. this video captured the torrent unleashed by the storm. ten feet of water su