According to Pew’s most recent National Public Opinion Reference Survey (Feb–Jun 2025), 46% of Americans identify with or lean toward the Republican Party, and 45% identify with or lean toward the Democratic Party. https://www.pewresearch.org/politics/fact-sheet/party-affili...
In a truly random U.S. sample you would expect Republican identifiers to be nearly as numerous as Democratic identifiers.
Not sure where you got your numbers from.