Of the 39 U.S. Senate seats up for contest this fall, 21 are held by Democrats and 18 by Republicans. And, barring an unexpected tide, the 64-to-36 Democratic majority of the 87th Congress is likely to stay much the same in the 88th. Such is the unpredictability of voters that elections often bring startling surprises, with some incumbents who had seemed safe losing after all, and some who had seemed to be in danger actually winning by huge margins. But as of last week, without benefit of hindsight, the line-up looked like this:


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