Pollster Lee Miringoff said on Wednesday that Republicans are in danger ahead of November's midterm elections due to a shrinking base. 

"In addition to [President] Trump's approval rating, it's the damaged brand right now, and that's what the Republicans have to worry about," Miringoff, who is the director of the Marist Institute for Public Opinion, told Hill.TV's Joe Concha on "What America's Thinking."

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"The base is shrinking because there are fewer Republicans. So the base is more solid than it was, but there's fewer of them," he said. 

The University of Virginia Center for Politics detailed party registration last week and found that there were nearly 12 million more registered Democrats than Republicans across 31 states and the District of Columbia. 

The analysis also found that 40 percent of all voters in party registration states are Democrats, while only 29 percent are Republicans. 

Gallup polling also shows more self-identifying Democrats than self-identifying Republicans in 2018, compared to earlier years when Republicans outnumbered Democrats. 

Republicans are preparing to defend the House, Senate and various state legislatures from what could be large Democratic turnout in November. 

— Julia Manchester