Now that U.S. Sen. Kyrsten Sinema has decided not to run for reelection, the race to fill her seat is between two presumptive frontrunners: U.S. Rep. Ruben Gallego, a Phoenix Democrat and U.S. Marines veteran, and Kari Lake, a Republican former newscaster who lost the 2022 race for governor. With Sinema out, more organizations have been throwing endorsements over to Gallego, so we decided it was a good time to start tracking endorsements of both candidates…