Yes, it would be more newsworthy the other way around, but here’s the press release from Matthews:

MD-8 Democratic Congressional Candidate Kathleen Matthews Endorses Hillary Clinton

Today MD-8 Democratic candidate Kathleen Matthews publicly endorsed Democratic Presidential candidate Hillary Clinton for President of the United States. Praising Clinton’s foreign and domestic policy experience, in addition to her record as a lifelong advocate for America’s working families, Matthews said Hillary Clinton would be the best possible President for our time. Matthews and Clinton have both been endorsed by EMILY’s List, the national organization dedicated to electing more pro-choice Democratic women.
Here is Matthews’ full statement:
“In 1920, this country ratified the 19th amendment to the U.S. Constitution granting women the right to vote. Nearly a century later, America has the opportunity to break down another barrier to full equality and respect by electing Hillary Clinton President of the United States.
I say this with the total conviction that Hillary Clinton, regardless of her gender, regardless of the significant history we can make next November, would be the best possible President for our time.
I ask you to have the courage to share this decision with me. There is no other progressive out there today running for President on a record such as Hillary’s: eight years as First Lady, eight as a U.S. senator, four as Secretary of State. Not only does she bring the most extensive experience in foreign policy and national security matters, Hillary Clinton has spent a lifetime championing the progressive causes of healthcare, education, child development, and, of course, gender equality.
I have been fortunate to work with Hillary Clinton on State Department initiatives to enhance economic opportunity for women around the world, to create jobs in Haiti following the devastating earthquake, and to promote youth employment here in America with the Clinton Global Initiative.
And as a reporter and later in my business career, I’ve seen she has the talent, the commitment, the seriousness of mind and emotion to be not only the first woman President but one of the great Presidents. It’s up to us to make it happen.
I endorse Hillary Clinton for President of the United States and expect to be forever proud that I did and did so now.”