Michelle Obama will turn 50 on Friday, and to celebrate, the Democratic Party asked supporters to sign a digital birthday card. The First Lady has so far received 237,451 birthday signatures, while Vice President Joe Biden -- whose birthday is on November 20 -- only received 132,381 signatures.

That’s one out of 176 registered Democrats in the country (there’s 42 million in total) who signed Mrs. Obama’s card, compared to one out of 317 Democrats who signed the VP’s card.

But while Mrs. Obama received more signatures, those only accounted for 4 percent of her Twitter followers, while Biden's signatures accounted for about a quarter of his campaign followers and more than half of those following his official White House Twitter account.