Possible Clues:

• Large tusked marine mammal
• Marine mammal was embracing lake sport
• Lewis Carroll character
• Republican law backed American creature
• Creature fell finally during hostilities with America
• The ___ and the Carpenter (Lewis Carroll poem)
• Run rule over American big beast
• On reflection, looked around address for a close relative of SEAL
• Tusked sea creature
• Mammal with tusks and a tough hide