In Virginia, Kaine and Allen are deadlocked at 46 percent apiece with likely voters.
In Ohio, incumbent Democratic Sen. Sherrod Brown leads Republican State Treasurer Josh Mandel 49 percent to 42 percent.
And in Florida, two-term Democratic Sen. Bill Nelson, leads GOP Rep. Connie Mack 51 percent to 37 percent. Twelve percent of Florida voters said they were undecided about the race.
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Democratic Senators holding the lead in Ohio & Florida
Republicans were hoping to be a lot closer in both states though for now, they have their work cut out for them. The Virginia battle is much harder to call and may remain that way until election day. NBC News/Wall Street Journal/Marist poll: