When it comes to employer-backed 401k plans, most experts say that the federal Thrift Savings Plan, with its 5% match and super-low administrative fees, is the best deal around. At the end of March, the TSP had 5.6 million participants and was worth $561 billion. Arthur Stein, a Washington area financial planner, spent a day on Capitol Hill last month talking to Senate staffers about their investment options. Most of them were in the TSP, but in some cases, he said they should be investing less. Why? Find out on this episode of the Your Turn radio show. Your Turn with Mike Causey airs at 10 a.m. EDT on 1500 AM in the Washington, D.C. area and www.federalnewsnetwork.com.