While this is true, coming from Graham it sounds like an attempt to shift blame away from Trump. "It's not that Trumpism did badly, it's that Ds were so good!"
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And there it is more explicitly.
What does Lindsey Lickspittle think is driving that great D fundraising?
From Manu Raju:
Pat Toomey: “It’s just one more data point in an overwhelming body of data that the Trump obsession is very bad for Republicans but normal Republicans are doing extremely well"
Graham to me: "I think we're losing close elections, not because of Donald Trump," citing D fundraising