Legislation would make permanent the USDA grant program that helps organic food producers grow their businesses to meet rising market demand  WASHINGTON, D.C. – U.S. Senator Peter Welch (D-Vt.), a member of the Senate Agriculture Committee, joined the Domestic Organic Investment Act, bipartisan legislation led by U.S. Senators Susan Collins (R-Maine) and Tammy Baldwin (D-Wis.),…