"Potato Marriage" joke

One night, the Potato family - Mother Potato and her three daughters - sat down to dinner. Midway through the meal, the eldest daughter spoke up. "Mother Potato?" she said. "I have an announcement to make."
"And what might that be?" said Mother, seeing the obvious excitement in her eldest daughter's eyes.
"Well," replied the daughter, with a proud but sheepish grin, "I'm getting married!"
The other daughters squealed with surprise as Mother Potato exclaimed, "Married! That's wonderful! And who are you marrying, eldest daughter?"
"I'm marrying a Russet!"
"A Russet!" replied Mother Potato with pride. "Oh, a Russet is a fine tater, a fine tater indeed!"
As the family shared in the eldest daughter's joy, the middle daughter spoke up. "Mother, I too, have anannouncement."
"And what might that be?" asked Mother Potato.
Not knowing quite how to begin, the middle daughter paused, then said with conviction, "I, too, am getting married!"
"You, too!"Mother Potato said with joy. "That's wonderful! Twice the good news in one evening! And who are you marrying, middle daughter?"
"I'm marrying an Idaho," beamed the middle daughter.
"An Idaho!" said Mother Potato with joy. "Oh, an Idaho is a fine tater, a fine tater indeed!"
Once again, the room came alive with laughter and excited plans for the future, when the youngest Potato daughter interrupted. "Mother? Mother Potato?
Umm, I, too, have anannouncement to make."
"Yes?" said Mother Potato with great anticipation.
"Well," began the youngest Potato daughter with the same sheepish grin as her eldest sister before her,"I hope this doesn't come as a shock to you, but I am getting married, as well!"
"Really?" said Mother Potato with sincere excitement. "All of my lovely daughters married! What wonderful news! And who, pray tell, are you marrying, youngest daughter, dear?"
"I'm marrying Dan Rather!"
"Dan Rather?!"
Mother Potato scowled suddenly. "But he's just a common tater!"