(CNN) - President Barack Obama is about to do something he's never done before.
The President will headline a roundtable event for the Senate Majority PAC Tuesday evening in New York City. It's the first time Obama has served as the main attraction at a fundraiser for the organization, which is the major outside group assisting Democratic Senate incumbents and candidates running in this year's midterm elections.
Super PAC's like Senate Majority PAC can raise unlimited funds. They began to spring up following the January 2010 "Citizens United" Supreme Court ruling that removed legal barriers preventing corporations and unions from spending unlimited sums on federal elections, which opened the flood gates to outside groups.
Republican groups were quick to take advantage of the high court ruling, and pro-GOP super PACs greatly outspent their Democratic rivals during the 2010 midterm elections. The President spoke out against such groups on the campaign trail during the 2010 midterms.
But during his 2012 re-election, Obama and his re-election team embraced the concept of a supportive outside group, and Priorities USA was formed. While the President did not directly raise money for the super PAC, he directed his top aides to help raise funds for the outside group.
After an earlier visit Tuesday to a workshop in Pittsburgh that aims to give entrepreneurs and inventors the tools needed to design and build their prototypes, Obama heads to New York City for the Senate Majority PAC event, which is being held at a midtown-Manhattan hotel.
Later in the evening, he heads about a dozen blocks downtown to Gotham Hall, where he'll be the main attraction at a Democratic National Committee Lesbian, Gay, Bisexual and Transgender (LGBT) gala. The fundraiser comes one day after the White House announced that the President will sign an executive order preventing federal contractors from discriminating against employees because of their sexual orientation or gender identity.
A Democratic Party official says Rep. Debbie Wasserman Schultz of Florida, the DNC chair, will join Obama at the event. Approximately 550 supporters will attend the gala, with tickets ranging from $1,200 up to $32,400 per person, according to the official.
The President wraps up the evening an hour later at a much smaller top dollar gathering. Obama will dine with some 30 Democratic Party supporters at the New York City home of fashion icon and Vogue editor Ana Wintour, who's been a major backer of the President. According to the official, those attending the dinner will contribute up to $32,400 to the DNC.
CNN Political Editor Paul Steinhauser contributed to this report.