>>> WELL JUST MOMENTS AFTER THE PRESIDENTIAL DEBATE ENDED LAST NIGHT, TAYLOR SWIFT THREW HER SUPPORT BEHIND KAMALA HARRIS. >> THE SUPERSTAR WROTE I HAVE DONE MY RESEARCH AND MADE MY CHOICE. AS WBZ POLITICAL ANALYST JON KELLER SHOWS US, HER WORDS MADE A QUICK IMPACT. >> Reporter: IT HAS BEEN NO SECRET THAT TAYLOR SWIFT IS NOT A DONALD TRUMP FAN AND NO SURPRISE SHE SHARES MANY OF KAMALA HARRIS' VIEWS ON WOMEN RIGHTS ISSUES. BUT SWIFT'S ENDORSEMENT OF HARRIS IS STILL BIG NEWS BECAUSE OF THE REACH OF HER PLATFORM. 300MILLION INSTAGRAM FOLLOWERS WORLDWIDE AND THE WAY SHE IS USING IT. A CBS POLL? JUNE FOUND JUST TWO-THIRDS OF VOTERS UNDER 30 SAID THEY PLANNED TO VOTE THIS YEAR. WELL BEHIND OLDER AGED GROUPS. SO SWIFT DIDN'T JUST ENDORSE HARRIS, SHE GAVE HER FANS SPECIFIC DETAILS OF HOW TO VOTE. AND INCLUDED A LINK TO THE VOTE.GOV WEBSITE THAT YIELDED MORE THAN 300,000 CLICKS IN JUST 12 HOURS. CELEBRITY ENDORSEMENT MEGAN DUNCAN NOTES HOW SWIFT STEERED HER FANS TOWARD SPECIFIC ACTION. >> POINTING OUT THAT ESPECIALLY FIRST TIME VOTERS NEED TO MAKE SURE THEY ARE REGISTERED AND REMINDING PEOPLE THAT IN MANY STATES, EARLY VOTING IS AN OPTION. >> Reporter: AND CONSULTANT ASHLEY SPALANE OBSERVES THAT SWIFT DIDN'T JUST TELL HER ADMIRERS TO FOLLOW HER LEAD. >> SHE EXPLAINED THE REASON AND THE TIMING FOR IT AND SHOWED A DEEP RESPECT FOR HER COMMUNITY. AND SHARED WITH THEM THAT THEY CAN MAKE THEIR OWN DECISION. >> Reporter: AND SO TO HER FANS ON THE TAYLOR SWIFT SUB REDDIT. I'M VOLUNTEERING WITH THE CAMPAIGN AND GOING HARD. I'M A MARRIED WOMAN WITH THREE KIDS AND A DOG. BUT TONIGHT, WE ARE ALL CHILDLESS CAT LADIES. >> I KNOW WHAT YOU ARE THINKING. WHAT ABOUT TRUMP'S CELEBRITY ENDORSEMENTS? WELL, THE TWO BIGGEST NAMES AT THE RNC WERE HULK HOGAN WITH TWO-AND-A-HALF MILLION INSTAGRAM FOLLOWERS AND KID ROCK WITH ONE MILLION. AGAIN, TAYLOR SWIFT HAS ABOUT 300 MILLION. I WOULD SAY SLIGHT EDGE TO SWIFT THERE. >> AND HE HAD SOMETHING TO SAY TODAY ABOUT TAYLOR SWIFT. >> Reporter: YEAH, HE DID. HE SAID THAT SHE WILL QUOTE PROBABLY PAY A PRICE IN THE MARKETPLACE FOR ENDORSING HIS OPPONENT. >> WOW. >> Reporter: SOMEHOW I THINK SHE CAN AFFORD IT. >> POLITICAL VIEWPOINTS HAVE LED TO BOYCOTTS BUT WE WILL SEE IF THIS IS THERE IS ACTUAL PAY BACK. >> Reporter: THAT'S SHOW BIZ. >> THIS IS A REMINDER THAT POP CULTURE GETS LAUGHED OFF