PORTLAND, Maine (AP) — The Democratic primary to take on Republican Sen. Susan Collins of Maine was shaken up Wednesday by the decision of one candidate to drop out and join a different race with similarly high stakes. In a move that could have implications for the closely divided U.S. House as well as the Senate, Jordan Wood, a onetime chief of staff to former U.S. Rep. Katie Porter, D-Calif., withdrew from the Senate race to seek the congressional seat representing Maine’s 2nd Congressional District, where incumbent Democratic U.S. Rep. Jared Golden recently announced that he will not seek another term. That leaves Gov.