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Similarly, 48 percent of Republicans said they were more likely to vote for Romney after hearing about the pick, while 48 percent of Democrats said the addition of the Wisconsin lawmaker would encourage them to come out for Obama.

Voters were also evenly split on Ryan's Medicare plan; while seven in 10 said they were "familiar with Paul RyanPaul Davis RyanUnscripted Trump keeps audience guessing in Rose Garden Coulter defends Paul Ryan: This is 100 percent Trump's fault The Hill's 12:30 Report — Presented by Kidney Care Partners — Trump escalates border fight with emergency declaration MORE's thinking on Medicare," 48 percent said they supported his plan and 47 percent said they opposed it.

Nevada's six electoral votes could play a deciding role in November's election; the president is hoping that the Hispanic population in the state can help him carry it, while Romney is leaning on the Mormon vote and Republicans energized from his heavy campaigning there during the primaries.

The poll carries a margin of error of 3.4 percent.