Missing Word Game Bowser for Prez

Missing Word Game Bowser for Prez, also referred to as Bowser for prez by its card and description, is a post in the News section released on Play Nintendo's website. The challenge of the post is to solve a cryptogram.

Questions
The solution is marked with a green border.

Letters
Each letter is represented by an item, block, or enemy.
 * A - Buzzy Beetle
 * B - Koopa Troopa (unused)
 * C - Hammer Bro
 * D - Piranha Plant (unused)
 * E - Red Shell
 * F - Green Shell (unused)
 * G - Warp Pipe (unused)
 * H - Note Block (unused)
 * I - Empty Block (unused)
 * J - POW Block (unused)
 * K - Brick Block (unused)
 * L - Goomba
 * M - ? Block (unused)
 * N - Yoshi's Egg
 * O - Propeller Mushroom
 * P - 1-Up Mushroom (unused)
 * Q - Super Star (unused)
 * R - Fire Flower
 * S - Super Mushroom
 * T - Coin
 * U - Bob-omb (unused)
 * V - Lakitu
 * W - Monty Mole (unused)
 * X - Boo (unused)
 * Y - Thwomp (unused)
 * Z - Cheep Cheep (unused)

Description
''Bowser’s running for class president, but it’s not because he wants to help anyone…except for himself! Can you solve the riddle below by using the answer key to find the right letters?''