Washington (CNN) – Former Secretary of State Hillary Clinton will headline a May 15 fundraiser for Marjorie Margolies, her daughter's mother-in-law and a Democratic candidate for a Pennsylvania congressional seat, according to a Democratic fundraising source.
The fundraiser, according to the source, will be held in New York City on May 15 – just five days before the Democratic primary for Pennsylvania's 13th District seat on May 20.
[twitter-follow screen_name='politicalticker'][twitter-follow screen_name='danmericacnn']
The fundraiser will be a new forum for Clinton, who has largely avoided highly political events and instead opted for paid speaking engagements and college appearances where she regularly comments on political issues. The Margolies' fundraiser will be the furthest foray into politics this year for the Democrats’ 2016 presidential frontrunner and could be a sign of more events to come.
Margolies – who represented the eastern Pennsylvania seat for two years in the early 90s – is in a very competitive race and is facing three other congressional hopefuls – state Sen. Daylin Leach, a progressive Democrat; Dr. Val Arkoosh, a physician and president of the National Physicians Alliance and State Rep. Brendan Boyle, a labor-backed Democrat who is endorsed by the Teamsters Union.
The Leach campaign responded quickly to the news that Clinton would campaign with Margolies, telling CNN in a statement that "Daylin Leach doesn't need famous relatives to come in and try to save his campaign because he's right on the issues."
Aides to both Clinton and Margolies did not respond to requests for comment on the fundraiser that was first reported by Politico.
Former President Bill Clinton campaigned for Margolies in April and noted that he "would be here if her son was not my son-in-law."
Marc Mezvinsky – Margolies' son – and Chelsea Clinton – the Clinton's only daughter – were married in 2010 and recently announced they would have their first child this fall.
The connections between Margolies – who used to be known as Margolies-Mezvinsky – and the Clintons date back to her first congressional stint.
After first stating that she would not support Clinton's 1993 budget, Margolies-Mezvinsky was swayed by personal lobbying from the president and ended up casting a seat-costing vote to pass the budget. The 1993 Omnibus Budget Reconciliation Act passed by just one vote, and Margolies-Mezvinsky was heralded by Democrats for backing the measure. While Democrats in the House were elated, some Republicans chanted "Goodbye Marjorie" from the House floor.
Local reaction to the vote was swift and Margolies-Mezvinsky was defeated in her 1994 reelection bid.
"I am not coming here saying vote for her because 20 years ago she saved the economy and gave up her seat to do it," Bill Clinton said at his April appearance. "You will never hear her [Margolies] say you have to vote for me for what I did then. What I hear her say is what I did shows what kind of member of Congress I will be if you give me another chance."
CNN Political Director Mark Preston contributed to this report.