“All Jewish Chanukah menorahs are for 8 candles, not 7”
A “Chanukah menorah” (actually called a “chanukiah”) has 9 branches. 1 for each of the 8 days of Chanukah and the shamash.
A menorah has 7 branches. The 7 branch menorah is a symbol of the Jewish people in Israel, perhaps our oldest symbol.
Cruz is giving a not-so-subtle signal of his support for Israel.
Thank you for your astute reply. Much appreciated.