Make all of New England merge! Two Leftard senators for that population is quite enough. I say this as a lifelong Boston sports fan who moved away, heh heh.
Combined population of the 6 states of New England is 14,444,865 in the 2010 census. That would make it one of the more substantially populated states, but still far less than Florida, Texas, and California, which have 2 senators each.
[of course I know there is zero chance of this happening, but it is fun to think about]