This eye-catching beetle shown here on Swamp Milkweed (asclepias incarnata) is the Swamp Milkweed Leaf-beetle (labidomera clivicollis).
It is aposematically colored, which means it is a species that advertise their distastefulness by being brightly colored.
This species displays the orange and black mimicry complex which includes the Monarch Butterflies. They feed on the leaves, stems, flowers and pollen of milkweed including Swamp and Common milkweed.