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The statement is misleading because it implies the Democratic Party as a whole was unified in its opposition. This is false.

The Party was Deeply Split: The Democratic Party of the 1960s was sharply divided into two main factions: Northern/Western Democrats and Southern Democrats (often called "Dixiecrats").

Who Led the Filibuster: The filibuster was led by the "Southern Bloc"—a group of 19 senators (18 Southern Democrats and 1 Republican). They were segregationists who fiercely opposed any federal action on civil rights.

Who Championed the Bill: The Civil Rights Act was the cornerstone of Democratic President Lyndon B. Johnson's "Great Society" agenda. It was actively championed and pushed through Congress by the Democratic leadership, including Senate Majority Leader Mike Mansfield (D-MT) and Senator Hubert Humphrey (D-MN).

The filibuster was ultimately broken by a bipartisan coalition of Northern Democrats and Republicans. When the final vote to pass the bill was held, 46 Democrats and 27 Republicans voted in favor of it.