Out west, Democratic Senate candidates are emphasizing their independent credentials, running far afield of the presidential race. In the east, Republican Senate nominees are pushing their moderate stances and differences with Mitt Romney. But through swaths of the Midwest and mid-Atlantic, where the Obama and Romney campaigns are running hard, you might say that rising tides lift all boats. Democrats Bill Nelson and Sherrod Brown are running comfortably ahead of Republican opponents Connie Mack and Josh Mandel in Florida and Ohio, respectively. Democrat Tim Kaine is running even or slightly...

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