Two main reasons:
1. Smart conservative citizens are sick of the taxes, and corrupt liberal governments.
2. Drunk liberal idiots and leftist homosexuals don't do a good job of procreating.
As these states lose taxpayers and congressional votes, they will lose power in congress and the Presidency.
Hopefully most of the fleeing Mass taxpayers will be Republicans not DUmmies.
2. Drunk liberal idiots and leftist homosexuals don't do a good job of procreating.
And there's always the abortion factor. Libs get abortions for their own convenience, eliminating children they might indoctrinate into liberalism. When the children of persons who do not abort babies escape the leftist public school systems, liberalism begins to die (please see Europe).