Hillary Clinton will have the birth of her second grandchild to look forward to next year -- perhaps right around the time of her party's nominating convention as daughter Chelsea Clinton tweeted Monday that she's expecting a second child "next summer," with husband Marc Mezvinsky. Hillary quickly responded on social media after the announcement, tweeting, "Your dad and I could not be happier for you, Marc, and Charlotte. We?re so excited to meet our second grandchild!" The Democratic frontrunner frequently discusses her granddaughter Charlotte, who was born in 2014, on the campaign trail. Earlier this year, in a preview of one of her campaign messages, Clinton wrote in a new epilogue to her book that "becoming a grandmother has made me think deeply about the responsibility we all share as stewards of the world we inherit and will one day pass on."
