(CNN) Pressure is mounting for a small group of undecided senators from each party who have about two weeks to decide how they will vote on Supreme Court nominee Judge Brett Kavanaugh.

Several Democrats running for re-election in Republican stronghold states won by President Donald Trump are facing tough political choices ahead of the midterm election: Vote for Kavanaugh and upset their base Democratic voters, possibly dampening turnout in November, or vote against the judge and risk angering Trump supporters in their states who might otherwise vote for them.

For now, they aren't saying how they will vote, but it's notable that they haven't come out against him, as so many of their Democratic colleagues have done.

Asked Wednesday if she had seen any red flags about Kavanaugh, North Dakota Democratic Sen. Heidi Heitkamp said, "not that I've seen so far."

But she said she is still "reviewing his record."

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