Yes, the old Rockefeller wing liberals have been supplanted by Democrats. Reaganite conservatives are practically non-existent in New England and New York. The voters are seeing there's no difference. Why choose a faux liberal when you can have the authentic one in a Democrat? And they're right. The GOP there is a shell of its former self that will never be resurrected - it has gone to where political parties die.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus