Katherine Clark, No. 2 House Democrat, gets progressive primary challenger

Progressive former Waltham City Councilor Jonathan Paz announced Monday that he’s challenging House Democratic Whip Katherine Clark (D-Mass.) for her seat.  “I’m challenging one of the most powerful Democrats in the House, because we need new leadership,” Paz said in a roughly two-minute ad. “Let’s just call it what it is: Our Democratic leaders are failing us.”  Paz founded two organizations supporting…