Graham Platner, a 40-year-old Army and Marine veteran who served four combat tours in Iraq and Afghanistan, launched his campaign for the Senate in Maine on Tuesday, joining a growing Democratic primary field seeking to take on Republican Sen. Susan Collins.

Platner, an oyster farmer who was born and raised in Sullivan, Maine, will run on a platform of universal health care, housing affordability and ending U.S. involvement in foreign wars.

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“I feel an obligation to protect this place and protect the people in it,” Platner said in an interview.

Platner joins a growing Democratic primary field that features Jordan Wood , a former chief of staff to former Rep. Katie Porter, D-Calif., and David Costello , who chal

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