That's a sharp rise for a single-day period compared to the number of new registrations made in the full months of September and August, which saw 190,178 and 56,669 new voters registered in total, respectively. Though Swift's social media post boosted voter registration in her home state of Tennessee by 50 percent, she's lost 25 percent of President Donald Trump's support.
The organization also said it received at least 2,144 voter registrations from Tennessee residents in the past 36 hours since her post, nearly half of the 5,183 people who have registered to vote there in October. Nationally, the site reported almost 156,000 unique visitors in the 24 hours since her post - second only to the numbers on National Voter Registration Day - and 65,000 registrations.
Bredesen faces republican nominee Rep. Marsha Blackburn in the November 6. election to replace Sen.
The Speak Now singer said she was a supporter of gay rights and women's rights, and against racism.
Swift went on to say that she will not vote for Marsha Blackburn, despite her desire to see women in office.
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Swift, 28, noted Blackburn's voted against equal pay for women, against reauthorizing the Violence Against Women Act that protects women from domestic abuse, and opposes marriage equality.
"Please, please educate yourself on the candidates running in your state and vote based on who most closely represents your values", she said.
Young voters in Tennessee can stand with Swift, for example, when she supports candidates who will fight for "ALL Americans, no matter their skin color, gender or who they love", as she wrote in her post.
Swift, who's typically silent on politics, has been criticized by some for not using her massive platform to engage fans on political issues. "She also believes they should not have the right to marry". [Taylor Swift] doesn't like your little games and she wants Tennesseans to know that you've been in the swamp long enough. These are not MY Tennessee values ... Traffic to Vote.org, a nonprofit organization that provides Americans with voter registration details and other information, spiked at 155,940 users from Sunday night through Monday evening - a significant jump from its average 14,708 daily users, the organization said.
In her Instagram post, Swift cited Republican politicians' disregard for human rights and her fear of racism as the reason for her intervention, writing: "I can not vote for someone who will not be willing to fight for dignity for ALL Americans, no matter their skin colour, gender or who they love".