No, that was never the case. Leftists in particular were quite anti-Israel, even historically and especially in actions if not in words. Lip service is worth the skin of the lips it comes from.
Many liberals once supported Israel. Liberal icon and martyr Sen. Robert F. Kennedy (D-NY) gave his life for his support of the country. Many anti-Vietnam war protesters that I knew supported Israel because, unlike Vietnam—in their view—Israel was a democracy.
The fact that it was ruled by socialists until 1987 may have added to Israel’s appeal among liberals.