NEW : President Clinton visits the Gulf Coast ; President Obama is coming Monday . A mandatory evacuation is lifted around a strained irrigation canal . The rain - swollen Mississippi River threatens to flood Kansas City . Hurricane Isaac dumped heavy rainfall on the area last week .
NEW : Secretary Napolitano visits the Gulf Coast ; President Obama is coming Monday . A mandatory evacuation is lifted around a strained Louisiana canal . The rain-swollen Pearl River threatens to flood Louisiana homes . Hurricane Isaac dumped heavy rains on the area last week .