By MyFM's Rick Michaels - A Whitman Republican will throw his hat in the ring tonight and challenge U.S. Senator Elizabeth Warren for her seat in Congress in 2018. State Representative Geoff Diehl will formally launch his campaign tonight at six o’clock in his hometown of Whitman. Meanwhile, U.S. Congressman Joe Kennedy, who’ll also be up for re-election next year, will be in Milford and Hopkinton today. Representing the 4th Congressional District, Kennedy will visit the MetroWest YMCA’s Family Outdoor Center and Camp this morning at ten o’clock and will then make his way to Milford. At 11:30 he’ll help prepare and distribute lunches at the Milford Summer Lunch program at the Memorial Elementary School on Walnut Street.